HELP - Car Won't Start - Fuel Pump Issue? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

bK_S14 · 09-06-2006, 02:34 AM

Hey everyone,

Car: 1995 240sx LE w/ABS

For some reason my car won't start after driving it without a problem only a couple hours ago. I had a similar problem about a half year ago but I replaced the battery, the spark plugs and the distributor cap/rotor. Currently, I have power, it turns but doesn't seem like there is fuel. When I turn the key, I don't hear the faint humming noise that the fuel pump makes.

Is it the fuel pump that needs to be replaced or could it be something else?

Also, where is the fuel pump located?

I took off the plate in the trunk and it has the hoses and wiring running to a large circular cap which also has wiring running into the fuel tank. (Sorry for the non technical wording.)

How hard is it to access the fuel pump/replace it?

Thanks to everyone in advance!

Barry

cotbu · 09-06-2006, 03:36 AM

Leave pump alone!! Check fuse and relay first, EGI pump is the fuel pump relay.

punxva · 09-06-2006, 09:24 AM

yea the last thing that u check should be the actual fuel pump itself, first test to see if you are hearing it priming when the key is in the on position, then if not check the fuse.

bK_S14 · 09-06-2006, 01:58 PM

I definitely don't hear the priming noise. I'll double check the fuse but providing that it is not the fuse, would it for sure be the fuel pump?

Where is the fuel pump located? - Someone told me that I have to drop the gas tank to get to it?

the head · 09-06-2006, 03:31 PM

to get the pump out (after you have replaced the Relay and the Fuse and did not solve problem)
1. disconnect battery
2. remove rubber lines from plate on gas tank (second plate below the four bolt plate in your trunk) be sure to label which one went where so you dont hook the shit back up the wrong way
3. unplug fuel pump subharness (connector about six inches from four bolt trunk plate running through it)
4. undo bolts on second plate (IIRC there are 8 of them)
5. remove unit (this piece has the fuel level sender and the fuel pump attached to it

shit just saw you had an S14 instructions are for S13...can anyone confirm the procedure?

g6civcx · 09-06-2006, 03:43 PM

On the first page after you search for "fuel pump relay".

http://www.zilvia.net/f/showthread.php?t=108545

idlafie · 09-08-2006, 02:07 AM

Before you go thru the hassle of replacing your fuel pump, test the wiring harness leading up to the fuel pump to make sure you are getting power to the fuel pump. You'll most definitely need to download a FSM to check the wiring harness for power, but trust me it's worth it.

It's possible that your fuel pump is okay, but you may have a faulty relay or bad ground wire somewhere leading up to the fuel pump. Check all your electrical lines & ground points to make sure that your wiring harness is okay & voltage is actually getting to your fuel pump.

A bad ground wire at the ECU / fuel pump relay or on the engine block could cause your S14 not to start. I had this problem years ago on my 95 S14. It took the Nissan "stealership" a few days to figure it out & several calls back & forth between me & the service manager to get things settled out.

The service manager told me my ECU was bad - but after proving him wrong by bringing in another S14 & ECU I borrowed from a friend, I was able to prove to the mechanic working on my car & the service manager that there was a short in the wiring harness somewhere. Sure enough they found it & resoldered a new ground wire connection on the engine block directly above the O2 sensor. Those ground wires there connect to the distributor, ECU, fuel pump & several other important components necessary to run your car.

Anyhow, hope this helps...
ID

simz · 09-08-2006, 11:50 AM

Had the same problem last night after moving up my wiring harness but it was just the EGI fuse.

nissan_blood · 09-08-2006, 06:43 PM

check fuel pump relay or relay ground....happends to me all the time

bK_S14 · 09-09-2006, 02:12 AM

Thank you everyone who has replied so far!

I checked the EGI fuse - that's fine. It was the Fuel Pump fuse itself. I replaced that. My car starts now but it's still giving me troubles.

My car moves... There's fuel to the engine but the problem varies. At low speed, it seems fine but when I need to accelerate, sometimes even when I floor it, I stay at the same speed. It's hard to describe.

Do you guys think that it's definitely the fuel pump?

Does anyone have experience with 1995 240sx LE with ABS and where the fuel pump is actually located? According to the FSM, I should be able to get at it through the trunk, take off that circular cap with all the hoses/wiring (pardon the non technical words) and just pull it straight out? I tried that but it seems that the fuel pump is deeper within the tank?
I asked a couple mechanics and they said that 1995 240sx with ABS, I'd have to drop the fuel tank from under the car to get at the fuel pump?

Please! Any input would be greatly appreciated!
Thanks in advance!

Tenchuu · 09-09-2006, 10:54 AM

BUll shit on dropping the tank, i replaces mine on my 98 about 6 times and never dropped the tank, just make sure you have about 1/4 tank of gas or less so you can reach it. you just thave to pull up the carpet on the pass through, then disconnect the tree hoses and un clip the wireing, then you have to unscrew the big white plat thing that seals the top of the tank.

once you have that off GET GLOVES, then follow the wireing down and into the tank and un-hook the pump and bracket. BE SURE to take note of how it goes in, a FSM can divulge the exact way, but basically it is a metal bracket that slides into two metal hoks in the tank. that is how you get the pump out.

and easy way to tell if the pump is working wou d be to disconect your fuel ine to the motor, and then get a frient to turn the key to the acc position briefly, if fuel comes out you are good and you don't need to mes around with all the damn hassle of geting to the pump. ALSO if someon replaces to a 300ZX fuel filter, sometimes the weight and length of that can cause a pinch in the rubber fuel hose to cause starvation like yuo are talking about , check all your rubber hoses under the hood to make sure that they are not kinked, it happens if you don't place the filter in the exact right position.

lastley is a a walbro or a regular fuel pump? i had some starvation issues with my walbro, in the end it was that the outlet nipple brok on it, so if you do go back there, make sure that the outlit hose has a solid connection on the nipple of the pump for staters.

but seriously, you really don't want to go through the hassle of getting to the fuel pump unless you are absolutley sure that is the problem.

bK_S14 · 09-09-2006, 11:09 AM

Gotcha! Thanks for the input, i'll try following the wires into the fuel tank and unhook the pump. It just seemed pretty deep. I'll double check the hoses too cause I'm definitely getting "starvation" as you say.

It's a regular fuel pump. I'm not even sure if it's been replaced within the past 11 years because I just got the car about 2-3 years ago.

Thanks again!

idlafie · 09-11-2006, 12:54 AM

Quote:

Originally Posted by bK_S14

Gotcha! Thanks for the input, i'll try following the wires into the fuel tank and unhook the pump. It just seemed pretty deep. I'll double check the hoses too cause I'm definitely getting "starvation" as you say.

It's a regular fuel pump. I'm not even sure if it's been replaced within the past 11 years because I just got the car about 2-3 years ago.

Thanks again!

Barry...you seem pretty intent on replacing your fuel pump!!

Before you do though, (if you have not already done so), try the following:

1). Download a FREE factory service manual from ZILVIA.net - you have to use the SEARCH feature here on Zilvia.

2). Replace your current fuel filter with either a Nissan 240SX or Nissan 300ZX (1990 model year & up) fuel filter.

3). Read up on the factory service manual procedures on how to test your Fuel Pressure Regulator. Test the fuel pressure at idle & under load. The factory service maual will tell you what the readings should be at idle & under load.

Try doing the above first to make sure the Fuel filter and the fuel pressure regulator are NOT the cause of your problems. If they aren't, THEN go ahead & replace your fuel pump.

Take our word for it........swapping out the fuel pump is something you DON'T want to do UNLESS you HAVE to.

Anyhow, hope this helps....good luck!!

ID

projectRDM · 09-11-2006, 08:08 AM

I'd just like to add, since it was noted numerous times, that having ABS has no bearing on the fuel pump. You can say it all you want, it doesn't matter.

Otherwise, the pump comes out right from the top like mentioned already, should take no more than five minutes.

09-06-2006, 02:34 AM	#1
bK_S14 Join Date: Jun 2005 Location: Victoria, BC, Canada Posts: 29 Trader Rating: (0) Feedback Score: 0 reviews	HELP - Car Won't Start - Fuel Pump Issue? Hey everyone, Car: 1995 240sx LE w/ABS For some reason my car won't start after driving it without a problem only a couple hours ago. I had a similar problem about a half year ago but I replaced the battery, the spark plugs and the distributor cap/rotor. Currently, I have power, it turns but doesn't seem like there is fuel. When I turn the key, I don't hear the faint humming noise that the fuel pump makes. Is it the fuel pump that needs to be replaced or could it be something else? Also, where is the fuel pump located? I took off the plate in the trunk and it has the hoses and wiring running to a large circular cap which also has wiring running into the fuel tank. (Sorry for the non technical wording.) How hard is it to access the fuel pump/replace it? Thanks to everyone in advance! Barry

09-06-2006, 03:36 AM	#2
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 50 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	Leave pump alone!! Check fuse and relay first, EGI pump is the fuel pump relay. __________________ LoverTechnologies "Half Broken Things!"

09-06-2006, 03:31 PM	#5
the head Nissanaholic! Join Date: Jul 2002 Location: in a dark room mastering the art of typing with one hand Posts: 2,164 Trader Rating: (3) Feedback Score: 3 reviews	to get the pump out (after you have replaced the Relay and the Fuse and did not solve problem) 1. disconnect battery 2. remove rubber lines from plate on gas tank (second plate below the four bolt plate in your trunk) be sure to label which one went where so you dont hook the shit back up the wrong way 3. unplug fuel pump subharness (connector about six inches from four bolt trunk plate running through it) 4. undo bolts on second plate (IIRC there are 8 of them) 5. remove unit (this piece has the fuel level sender and the fuel pump attached to it shit just saw you had an S14 instructions are for S13...can anyone confirm the procedure? __________________ I never knew you could do that with an eggplant

09-08-2006, 02:07 AM	#7
idlafie Zilvia Addict Join Date: Mar 2004 Location: ..So Cal.... Posts: 940 Trader Rating: (0) Feedback Score: 0 reviews	Before you go thru the hassle of replacing your fuel pump, test the wiring harness leading up to the fuel pump to make sure you are getting power to the fuel pump. You'll most definitely need to download a FSM to check the wiring harness for power, but trust me it's worth it. It's possible that your fuel pump is okay, but you may have a faulty relay or bad ground wire somewhere leading up to the fuel pump. Check all your electrical lines & ground points to make sure that your wiring harness is okay & voltage is actually getting to your fuel pump. A bad ground wire at the ECU / fuel pump relay or on the engine block could cause your S14 not to start. I had this problem years ago on my 95 S14. It took the Nissan "stealership" a few days to figure it out & several calls back & forth between me & the service manager to get things settled out. The service manager told me my ECU was bad - but after proving him wrong by bringing in another S14 & ECU I borrowed from a friend, I was able to prove to the mechanic working on my car & the service manager that there was a short in the wiring harness somewhere. Sure enough they found it & resoldered a new ground wire connection on the engine block directly above the O2 sensor. Those ground wires there connect to the distributor, ECU, fuel pump & several other important components necessary to run your car. Anyhow, hope this helps... ID __________________ Weekend Mechanic for my Not-So-Mechanically-Inclined buddies....

09-06-2006, 01:58 PM	#4
bK_S14 Join Date: Jun 2005 Location: Victoria, BC, Canada Posts: 29 Trader Rating: (0) Feedback Score: 0 reviews	I definitely don't hear the priming noise. I'll double check the fuse but providing that it is not the fuse, would it for sure be the fuel pump? Where is the fuel pump located? - Someone told me that I have to drop the gas tank to get to it?

09-06-2006, 03:43 PM	#6
g6civcx Post Whore! Join Date: Apr 2004 Location: Virginia, USA Posts: 5,764 Trader Rating: (5) Feedback Score: 5 reviews	On the first page after you search for "fuel pump relay". http://www.zilvia.net/f/showthread.php?t=108545

09-08-2006, 11:50 AM	#8
simz Join Date: Nov 2005 Location: VA Posts: 19 Trader Rating: (0) Feedback Score: 0 reviews	Had the same problem last night after moving up my wiring harness but it was just the EGI fuse.

09-08-2006, 06:43 PM	#9
nissan_blood Join Date: Sep 2006 Location: louisiana Age: 37 Posts: 15 Trader Rating: (0) Feedback Score: 0 reviews	check fuel pump relay or relay ground....happends to me all the time

09-09-2006, 02:12 AM	#10
bK_S14 Join Date: Jun 2005 Location: Victoria, BC, Canada Posts: 29 Trader Rating: (0) Feedback Score: 0 reviews	Thank you everyone who has replied so far! I checked the EGI fuse - that's fine. It was the Fuel Pump fuse itself. I replaced that. My car starts now but it's still giving me troubles. My car moves... There's fuel to the engine but the problem varies. At low speed, it seems fine but when I need to accelerate, sometimes even when I floor it, I stay at the same speed. It's hard to describe. Do you guys think that it's definitely the fuel pump? Does anyone have experience with 1995 240sx LE with ABS and where the fuel pump is actually located? According to the FSM, I should be able to get at it through the trunk, take off that circular cap with all the hoses/wiring (pardon the non technical words) and just pull it straight out? I tried that but it seems that the fuel pump is deeper within the tank? I asked a couple mechanics and they said that 1995 240sx with ABS, I'd have to drop the fuel tank from under the car to get at the fuel pump? Please! Any input would be greatly appreciated! Thanks in advance!

09-09-2006, 10:54 AM	#11
Tenchuu Post Whore! Join Date: Apr 2004 Location: Oregon Age: 42 Posts: 2,474 Trader Rating: (8) Rides Gallery: Tenchuu Feedback Score: 8 reviews	BUll shit on dropping the tank, i replaces mine on my 98 about 6 times and never dropped the tank, just make sure you have about 1/4 tank of gas or less so you can reach it. you just thave to pull up the carpet on the pass through, then disconnect the tree hoses and un clip the wireing, then you have to unscrew the big white plat thing that seals the top of the tank. once you have that off GET GLOVES, then follow the wireing down and into the tank and un-hook the pump and bracket. BE SURE to take note of how it goes in, a FSM can divulge the exact way, but basically it is a metal bracket that slides into two metal hoks in the tank. that is how you get the pump out. and easy way to tell if the pump is working wou d be to disconect your fuel ine to the motor, and then get a frient to turn the key to the acc position briefly, if fuel comes out you are good and you don't need to mes around with all the damn hassle of geting to the pump. ALSO if someon replaces to a 300ZX fuel filter, sometimes the weight and length of that can cause a pinch in the rubber fuel hose to cause starvation like yuo are talking about , check all your rubber hoses under the hood to make sure that they are not kinked, it happens if you don't place the filter in the exact right position. lastley is a a walbro or a regular fuel pump? i had some starvation issues with my walbro, in the end it was that the outlet nipple brok on it, so if you do go back there, make sure that the outlit hose has a solid connection on the nipple of the pump for staters. but seriously, you really don't want to go through the hassle of getting to the fuel pump unless you are absolutley sure that is the problem.

09-09-2006, 11:09 AM	#12
bK_S14 Join Date: Jun 2005 Location: Victoria, BC, Canada Posts: 29 Trader Rating: (0) Feedback Score: 0 reviews	Gotcha! Thanks for the input, i'll try following the wires into the fuel tank and unhook the pump. It just seemed pretty deep. I'll double check the hoses too cause I'm definitely getting "starvation" as you say. It's a regular fuel pump. I'm not even sure if it's been replaced within the past 11 years because I just got the car about 2-3 years ago. Thanks again!

09-11-2006, 08:08 AM	#14
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 51 Posts: 13,812 Trader Rating: (12) Feedback Score: 12 reviews	I'd just like to add, since it was noted numerous times, that having ABS has no bearing on the fuel pump. You can say it all you want, it doesn't matter. Otherwise, the pump comes out right from the top like mentioned already, should take no more than five minutes.