Walbro Install: Gas Gauge Always Reads Past Full - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

GripSpec · 12-09-2012, 04:08 PM

A walbro fp was installed during my SR swap, and ever since my gauge has not read correctly. Most of the time it reads above the full line and sometimes wonders around a bit. A friend who was helping with my swap installed the fp while I was putting the motor in, so I have not personally seen the inner workings of the install. I have tried a couple different clusters to rule out any issues with that. I'm very unfamiliar with fuel systems, so I'm not exactly sure what to look for or test to diagnose this. Can the sending arm get stuck, or does this sound like a wiring/resistance issue? The gas gauge worked perfectly fine before installing the pump. Any help would be greatly appreciated.

801nismo104 · 12-09-2012, 04:36 PM

take out the pump and make sure the fuel level sender arm thingy isnt stuck on something

The Dude · 12-09-2012, 06:58 PM

Sounds like a problem with the sending unit. Could be you did something when you removed it.

KoukiMonsta · 12-09-2012, 08:58 PM

Quote:

Originally Posted by 801nismo104

take out the pump and make sure the fuel level sender arm thingy isnt stuck on something

Sounds like this to me

Jay24/7 · 12-09-2012, 11:36 PM

Quote:

Originally Posted by 801nismo104

take out the pump and make sure the fuel level sender arm thingy isnt stuck on something

+1

Also check the wiring on the top of the fuel hanger, possibly shorting out causing the gauge to read full all the time.

GripSpec · 12-12-2012, 08:18 PM

Thanks for the suggestions guys, I was able to take everything apart last night. I am very confused by what I found. All wiring is in working order and the fuel level sender works fine when it is pulled out of the tank. This lead me to think that the sender arm was just getting caught up on something as suggested above. After working on it for awhile I noticed that I had to put pressure on the pump hanger to get it to line up with the holes on the top of the tank. It seems as though the pump hanger is making contact with the metal baffling inside the tank. Has anyone ever heard of a problem like this?? I'm thinking about trying to bend the metal baffling a bit to take the pressure off the hanger/level sender but I'm not sure if that will work.

12-09-2012, 04:08 PM	#1
GripSpec Leaky Injector Join Date: Dec 2007 Location: Richmond, VA Age: 38 Posts: 93 Trader Rating: (5) Feedback Score: 5 reviews	Walbro Install: Gas Gauge Always Reads Past Full A walbro fp was installed during my SR swap, and ever since my gauge has not read correctly. Most of the time it reads above the full line and sometimes wonders around a bit. A friend who was helping with my swap installed the fp while I was putting the motor in, so I have not personally seen the inner workings of the install. I have tried a couple different clusters to rule out any issues with that. I'm very unfamiliar with fuel systems, so I'm not exactly sure what to look for or test to diagnose this. Can the sending arm get stuck, or does this sound like a wiring/resistance issue? The gas gauge worked perfectly fine before installing the pump. Any help would be greatly appreciated.

12-09-2012, 04:36 PM	#2
801nismo104 Zilvia Member Join Date: May 2010 Location: Utah Posts: 233 Trader Rating: (8) Feedback Score: 8 reviews	take out the pump and make sure the fuel level sender arm thingy isnt stuck on something

12-09-2012, 06:58 PM	#3
The Dude Zilvia Junkie Join Date: Sep 2003 Location: TN Age: 40 Posts: 357 Trader Rating: (4) Feedback Score: 4 reviews	Sounds like a problem with the sending unit. Could be you did something when you removed it.

12-12-2012, 08:18 PM	#6
GripSpec Leaky Injector Join Date: Dec 2007 Location: Richmond, VA Age: 38 Posts: 93 Trader Rating: (5) Feedback Score: 5 reviews	Thanks for the suggestions guys, I was able to take everything apart last night. I am very confused by what I found. All wiring is in working order and the fuel level sender works fine when it is pulled out of the tank. This lead me to think that the sender arm was just getting caught up on something as suggested above. After working on it for awhile I noticed that I had to put pressure on the pump hanger to get it to line up with the holes on the top of the tank. It seems as though the pump hanger is making contact with the metal baffling inside the tank. Has anyone ever heard of a problem like this?? I'm thinking about trying to bend the metal baffling a bit to take the pressure off the hanger/level sender but I'm not sure if that will work.