Walbro Fuel pump (Searched) - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Dream240 · 02-08-2007, 05:32 PM

Okay I already know what to do for the install, jobs been done but....here's my problem

I got the pump in fine, replaced the o-ring, and replaced all the tank/pump locking bolts (x6) with new ones(washers too)

I am still getting a leak from the fuel pump tank seal!! I'm not sure if maybe the walbro creates too much presure for the seal to handle? I have never heard of this, but is it even possible?
I also am thinking that I tightened the bolts too tight. The FSM only calls for 2 ft lbs. which is really not alot. I'm assuming the pressurization causes the seal to sink into place? So now I'm at a loss. The fuel lines aren't leaking, I know this cause when I pulled the trunk cover off, all around the rim of the pump cover is wet, especially on the rear bumper side. I also didn't notice the leak until I filled up....

Anyone else ever have this happen? I'm gonna replace the seal again and retighten the bolts gently....maybe too much torque?

Any input would help thanks.

nrg · 02-08-2007, 05:40 PM

the o-ring gasket is not sitting correctly. do you smell gas inside your car?

mRclARK1 · 02-08-2007, 05:41 PM

Possibly the seal you replaced the old one with was faulty? I've never even had a hint of a leak with my walbro... and I didn't even replace the seal when I put mine in; just re-used the old one.

Wei240 · 02-08-2007, 05:50 PM

you probably want to recheck that dang o ring, mine was sooooooo difficult to put back in, look at bjorkluv's post on walbro install....

Dream240 · 02-09-2007, 06:08 AM

Alright well, I put ANOTHER o-ring in, they're cheap like 11 bucks. Only this time I didn't tighten down the bolts super tight. Used hand snug plus a slight turn, figured that equaled about 2 ft/lbs.

Okay so I drove this morning to my carpool, got out checked the pump......LEAKING still!!!! But this time the leak isn't as bad and it's coming out of the back portion. All the way to work I sat thinking about what I'm doing wrong and it hit me....the bolts I used to replace the old stock bolts (two of which stripped out) are too long!!! I got the same type of bolts.... M5x.8, but the shortest they had was 10mm. I'm thinking I needed at least 8mm.

I deduced that when I tighten them down, they are pushing against the metal ring underneath which is exactly what the o-ring sets on, thus creating enough gap to cause a leak!! Makes sense since this time I only tightened them down a lil' bit and the leaks not a bad. So I'm gonna throw some more washers in there today after work and see if that fixes it.

I'll let you guys know. Thanks to all for the input.

steve shadows · 02-09-2007, 02:57 PM

maybe its the actual fuel line that is leaking, not the seal.

Dream240 · 02-09-2007, 03:38 PM

No I've been checking that each time I look at it. The lines, even the hump right above the bolt section is dry. But around the edge of the seal is all wet, and the fuel is flowing with the driving down the back of the tank. The little palstic wire connectors that come right out of the top are dry.

Based on this mornings leak which is minimal, it's starting from the back seal section. I got some more washers, gonna gap up the bolts and see if that fixes it. I'm sure the seal will work fine after that.. I'll let you guys know.

Thanks.

Dream240 · 02-12-2007, 06:33 AM

Well, turns out the 10mm bolts I bought were too long. I gapped them up and no leaks.

Dammit I hate it when it's something stupid on my part....That's what I get for rushing the job.

Thanks guys.

02-08-2007, 05:32 PM	#1
Dream240 Nissanaholic! Join Date: Dec 2002 Location: Inland Empire, California Age: 46 Posts: 2,188 Trader Rating: (8) Feedback Score: 8 reviews	Walbro Fuel pump (Searched) Okay I already know what to do for the install, jobs been done but....here's my problem I got the pump in fine, replaced the o-ring, and replaced all the tank/pump locking bolts (x6) with new ones(washers too) I am still getting a leak from the fuel pump tank seal!! I'm not sure if maybe the walbro creates too much presure for the seal to handle? I have never heard of this, but is it even possible? I also am thinking that I tightened the bolts too tight. The FSM only calls for 2 ft lbs. which is really not alot. I'm assuming the pressurization causes the seal to sink into place? So now I'm at a loss. The fuel lines aren't leaking, I know this cause when I pulled the trunk cover off, all around the rim of the pump cover is wet, especially on the rear bumper side. I also didn't notice the leak until I filled up.... Anyone else ever have this happen? I'm gonna replace the seal again and retighten the bolts gently....maybe too much torque? Any input would help thanks. __________________ Don't mess with my monkey...he's loaded.

02-08-2007, 05:40 PM	#2
nrg Zilvia FREAK! Join Date: Mar 2004 Location: CA Age: 40 Posts: 1,571 Trader Rating: (1) Feedback Score: 1 reviews	the o-ring gasket is not sitting correctly. do you smell gas inside your car? __________________ driftingisgay.com

02-08-2007, 05:41 PM	#3
mRclARK1 Post Whore! Join Date: Sep 2005 Location: Location? Posts: 4,205 Trader Rating: (0) Feedback Score: 0 reviews	Possibly the seal you replaced the old one with was faulty? I've never even had a hint of a leak with my walbro... and I didn't even replace the seal when I put mine in; just re-used the old one. __________________

02-09-2007, 06:08 AM	#5
Dream240 Nissanaholic! Join Date: Dec 2002 Location: Inland Empire, California Age: 46 Posts: 2,188 Trader Rating: (8) Feedback Score: 8 reviews	Alright well, I put ANOTHER o-ring in, they're cheap like 11 bucks. Only this time I didn't tighten down the bolts super tight. Used hand snug plus a slight turn, figured that equaled about 2 ft/lbs. Okay so I drove this morning to my carpool, got out checked the pump......LEAKING still!!!! But this time the leak isn't as bad and it's coming out of the back portion. All the way to work I sat thinking about what I'm doing wrong and it hit me....the bolts I used to replace the old stock bolts (two of which stripped out) are too long!!! I got the same type of bolts.... M5x.8, but the shortest they had was 10mm. I'm thinking I needed at least 8mm. I deduced that when I tighten them down, they are pushing against the metal ring underneath which is exactly what the o-ring sets on, thus creating enough gap to cause a leak!! Makes sense since this time I only tightened them down a lil' bit and the leaks not a bad. So I'm gonna throw some more washers in there today after work and see if that fixes it. I'll let you guys know. Thanks to all for the input. __________________ Don't mess with my monkey...he's loaded.

02-09-2007, 02:57 PM	#6
steve shadows Post Whore! Join Date: Aug 2003 Location: LA and OC Posts: 8,202 Trader Rating: (5) Feedback Score: 5 reviews	maybe its the actual fuel line that is leaking, not the seal. __________________ Like Me on FaceBook !

02-08-2007, 05:50 PM	#4
Wei240 Nissanaholic! Join Date: Sep 2002 Location: socal Posts: 1,778 Trader Rating: (0) Feedback Score: 0 reviews	you probably want to recheck that dang o ring, mine was sooooooo difficult to put back in, look at bjorkluv's post on walbro install....

02-09-2007, 03:38 PM	#7
Dream240 Nissanaholic! Join Date: Dec 2002 Location: Inland Empire, California Age: 46 Posts: 2,188 Trader Rating: (8) Feedback Score: 8 reviews	No I've been checking that each time I look at it. The lines, even the hump right above the bolt section is dry. But around the edge of the seal is all wet, and the fuel is flowing with the driving down the back of the tank. The little palstic wire connectors that come right out of the top are dry. Based on this mornings leak which is minimal, it's starting from the back seal section. I got some more washers, gonna gap up the bolts and see if that fixes it. I'm sure the seal will work fine after that.. I'll let you guys know. Thanks. __________________ Don't mess with my monkey...he's loaded.

02-12-2007, 06:33 AM	#8
Dream240 Nissanaholic! Join Date: Dec 2002 Location: Inland Empire, California Age: 46 Posts: 2,188 Trader Rating: (8) Feedback Score: 8 reviews	Well, turns out the 10mm bolts I bought were too long. I gapped them up and no leaks. Dammit I hate it when it's something stupid on my part....That's what I get for rushing the job. Thanks guys. __________________ Don't mess with my monkey...he's loaded.