Calling A-bodies w/Impala tank, help me solve my leak!
09-09-2012, 04:18 PM
#1
Calling A-bodies w/Impala tank, help me solve my leak! Well I'm really enjoying my Cutlass w/LSx power, but I have a problem w/my impala tank. I bought the tank w/o a sending unit, and got the sending unit off a member of the impala forum. Used the racetronix kit to power my fuel.
Well my first filling up of the tank had gas come out of the top of the tank at the sending unit. Unfortunately I had not included the O-ring. So I order the o-ring AC Delco G19 and install it. Still have a fuel smell; go ahead and fill it up again and gas leaks out the top again! I don't really know what I could have done wrong. Look at the pics and see if you can tell me what I'm doing wrong. This is really bugging me. When I did pull the sending unit out, the G19 o-ring now seems a bit bigger than the round circle it fits in. I tightened it all back up and criss crossed the nuts down as tight as they would go, but still have fumes, and undoubtedly if I filled it up it would still leak.
thoughts? thx!!!
Well my first filling up of the tank had gas come out of the top of the tank at the sending unit. Unfortunately I had not included the O-ring. So I order the o-ring AC Delco G19 and install it. Still have a fuel smell; go ahead and fill it up again and gas leaks out the top again! I don't really know what I could have done wrong. Look at the pics and see if you can tell me what I'm doing wrong. This is really bugging me. When I did pull the sending unit out, the G19 o-ring now seems a bit bigger than the round circle it fits in. I tightened it all back up and criss crossed the nuts down as tight as they would go, but still have fumes, and undoubtedly if I filled it up it would still leak.
thoughts? thx!!!
09-09-2012, 04:47 PM
#2
Can't really see or say I see anything wrong.. just a few things to look at or consider..:
- Is any of the metal parts bent ?..
- Is there fuel leaking on the top of the sending unit.. I think the out/feed tube ?
- Also, I don't think you should be overtighting the unit down. Check for the correct torque specs on tighting. The O-ring could have been pushed out if over tighten.
BC
- Is any of the metal parts bent ?..
- Is there fuel leaking on the top of the sending unit.. I think the out/feed tube ?
- Also, I don't think you should be overtighting the unit down. Check for the correct torque specs on tighting. The O-ring could have been pushed out if over tighten.
BC
09-09-2012, 04:55 PM
#3
I can't see where the fuel comes out, but not the top ring. At that point I've been shutting down the fuel dispensor. I don't see anything bent. Could the fuel smell be from the vent line as well? Anybody else have fuel leak or fume issues w/the impala tank?
09-12-2012, 06:18 AM
#5
TECH Fanatic
Are you installing the o-ring dry? If so it might not be seating square. Try a light lubricant like WD 40. I have encountered the same issue in other fuel pump replacements and a bit of lube helped. I also had a bit of a smell, attributed it to the vent plumbing. I have all of the vents(sender and filler) tied together. When I get a chance I will add a check valve and filter, that should solve the aroma.
09-12-2012, 07:55 AM
#6
I cant remember exactly what mine was like. But are you installing the O ring on top of the sender? I was thinking mine had an O ring between the sender and tank.
Also, there are 2 vents on top of the tank. the rear large one should connect to the filler neck. The vent that's part of the sender should have a anti-overflow valve that blocks fuel from coming out. It may not be working. I connected that vent to the vapor tank on my 72 442.
Also, there are 2 vents on top of the tank. the rear large one should connect to the filler neck. The vent that's part of the sender should have a anti-overflow valve that blocks fuel from coming out. It may not be working. I connected that vent to the vapor tank on my 72 442.
09-13-2012, 05:15 AM
#7
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Problem #1 the tabs on the fuel pump sending unit go THROUGH the slots on the ring. Bend the tabs back and line everything up as it should be.
Problem #2 the Tank only uses one O-Ring. Last time I R&R'd my tank in April, it only had one o-ring as it has all the other times. I think it was on top of the sender (don't quote me). I'll have to rack my brain to verify.
Problem #2 the Tank only uses one O-Ring. Last time I R&R'd my tank in April, it only had one o-ring as it has all the other times. I think it was on top of the sender (don't quote me). I'll have to rack my brain to verify.
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09-13-2012, 05:27 AM
#8
I cant remember exactly what mine was like. But are you installing the O ring on top of the sender? I was thinking mine had an O ring between the sender and tank.
Also, there are 2 vents on top of the tank. the rear large one should connect to the filler neck. The vent that's part of the sender should have a anti-overflow valve that blocks fuel from coming out. It may not be working. I connected that vent to the vapor tank on my 72 442.
Also, there are 2 vents on top of the tank. the rear large one should connect to the filler neck. The vent that's part of the sender should have a anti-overflow valve that blocks fuel from coming out. It may not be working. I connected that vent to the vapor tank on my 72 442.
09-18-2012, 05:37 AM
#16
Well I did a bit more research and apparently there is an RTV that works w/gas (dow corning 730), but its about $80 for a tube! I was thinking of trying in the short term some anaerobic RTV that is used to seal transmission cases, but looking at my oring, it is the problem--don't think rtv will help. It wasn't larger when I put it on the first time. I don't know how but it is much larger than the ring hole it is supposed to sit in; I suspect I must have not had it seated properly when I tightened it down originally. Unfortunately my new oring is several days away (shipped from Amazon). So I'll wait till I get it.
09-18-2012, 09:19 AM
#18
TECH Apprentice
Rubber tends to expand if it soaks in gas and has room to grow, ie. if it isn't seated properly and has room to pop out of its groove. Take an old oring and hit it with brake parts cleaner or carb cleaner and it will never fit back into the place it was supposed to go. I rebuilt an ATV carb one time, the float was sticking, when I tore it back apart the rubber seal that went in the float bowl to seal it to the carb body got gas on it, had to buy a new seal, the thing grew to almost twice it's size.
