Fuel Leaks....
Thread Starter
Instructor
Joined: Jan 2005
Posts: 129
Likes: 0
From: Huntington Beach CA
Fuel Leaks....
During an AC rebuild I noticed that I have a fuel leak at the fuel pump... it's one of those where you start fixing a loose nut and end up converting the AC to R134... 
Anyway the problem is I can't tell exactly where it's coming from, there's fuel dripping from the two rubber pipes that run from the main fuel lines to the pump but that maybe because they're the lowest point on the pump. There's also fuel on the pipe that runs up to the carb... does anyone have experience with fuel pumps on a 1980 C3 and where they are most likely to leak? And if so what is the best course to remedy this?
Any help would be much appreciated!
Anyway the problem is I can't tell exactly where it's coming from, there's fuel dripping from the two rubber pipes that run from the main fuel lines to the pump but that maybe because they're the lowest point on the pump. There's also fuel on the pipe that runs up to the carb... does anyone have experience with fuel pumps on a 1980 C3 and where they are most likely to leak? And if so what is the best course to remedy this?
Any help would be much appreciated!
Instructor
Joined: Oct 2004
Posts: 173
Likes: 0
From: Hattiesburg MS
I notice that you said "pipe up to the carb", are you running a Q-jet carb? I have a ' 77 and while still running the Q-jet had problems with the fuel fitting leaking at the carb. I used Loc-tite thread sealer, not locker, and put an end to the problem. My advice would be to find the highest leak and fix it first, as you said the drip from the bottom hoses may be because they are the lowest point. Hope this helps.
Burning Brakes
Joined: Jan 2001
Posts: 1,004
Likes: 16
From: Gainesville, Florida
Originally Posted by more_cc's
Thanks, just out of interest can the fuel pump itself leak? I know it's a sealed unit but I'm wondering if it could be to blame.
Thanks
Thanks
Melting Slicks
Joined: Aug 2004
Posts: 2,704
Likes: 6
From: Toronto
Originally Posted by gearheadz
If the pump diaphram fails, it will pour out of the pump not leak so I agree it's probably a small leak at the carb fitting or where the rubber attachs to the fittings.
xactly what happened to my car.
Thread Starter
Instructor
Joined: Jan 2005
Posts: 129
Likes: 0
From: Huntington Beach CA
Thanks for all your help... a couple more things;
Last night I emptied the tank, took off the rubber hoses that go from the main fuel lines into the pump, disconnected the metal pipe that runs from the fuel pump to the carb. I'm going to replace the rubber pipes and I would like to replace the metal pipe as well.
Now has anyone managed to remove/replace this pipe without removing most of the engine!?!
Also whilst I'm here is it a good idea to replace the gaskets of the fuel pump to the engine block? Or should I just replace the whole fuel pump? I don't really like the idea of draining the tank again!!!
1980 C3 350cu
Thanks
Last night I emptied the tank, took off the rubber hoses that go from the main fuel lines into the pump, disconnected the metal pipe that runs from the fuel pump to the carb. I'm going to replace the rubber pipes and I would like to replace the metal pipe as well.
Now has anyone managed to remove/replace this pipe without removing most of the engine!?!
Also whilst I'm here is it a good idea to replace the gaskets of the fuel pump to the engine block? Or should I just replace the whole fuel pump? I don't really like the idea of draining the tank again!!!
1980 C3 350cu
Thanks
Melting Slicks
Joined: Sep 2004
Posts: 2,655
Likes: 19
Originally Posted by more_cc's
Thanks, just out of interest can the fuel pump itself leak? I know it's a sealed unit but I'm wondering if it could be to blame.
Thanks
Thanks
Gary
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Drifting
Joined: Nov 2001
Posts: 1,469
Likes: 6
From: 68 427 4.11s Roadster
If you can't find the leak source with your hand try a patch of paper towel. Start high and move down. Simple indicator of where the gas is starting from.
Then you can decide on what needs to be fixed.
It might be blowing out in a fine mist but that should be visable if looked for.
Then you can decide on what needs to be fixed.
It might be blowing out in a fine mist but that should be visable if looked for.
