Fuel Pump 101
Thread Starter
Drifting
Joined: Sep 1999
Posts: 1,439
Likes: 1
From: Hagerstown MD
Fuel Pump 101
OK, I'm hoping that I can do the "first crank" on my engine this weekend. I'm looking at the fuel pump/fuel line connection and there is a brass elbow with pipe threads that go into the fuel pump (AC Delco) and a female flare fitting on the other side that connects to the carb fuel pipe.
My questions:
1. Do I need any Teflon tape on the pipe threads? The factory didn't use it. How tight should I crank this fitting down? (I have the original but I plan to replace it since the flare seat looks like it's damaged.)
2. I assume that I don't need any Teflon tape on the flare fittings since the seal is accomplished by the use of the flare. Correct?
My questions:
1. Do I need any Teflon tape on the pipe threads? The factory didn't use it. How tight should I crank this fitting down? (I have the original but I plan to replace it since the flare seat looks like it's damaged.)
2. I assume that I don't need any Teflon tape on the flare fittings since the seal is accomplished by the use of the flare. Correct?
Safety Car
Joined: Jun 2001
Posts: 4,004
Likes: 2
From: Severna Park Md
Re: Fuel Pump 101 (zymurgist)
Defnitaly dont need tape on the flare fittings. You are correct in that the flare makes the seal. On the pipe fittings its not nessisarly needed if you thighten it enough. If you do use teflon tape make sure not to let any of it get into or across the the opening thru the fitting.
Race Director
Joined: Feb 1999
Posts: 19,659
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From: Lenoir City Tennessee
Ci 6, 8 & 10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15
Re: Fuel Pump 101 (Jvette73)
I used teflon tape. That was a mistake. It leaked and I never could get it to quit leaking. I took the tape off and it hasn't leaked since. That is my experience.
Drifting
Joined: Dec 2002
Posts: 1,426
Likes: 1
From: San Diego, CA Website: ChrisMitchell.us
Re: Fuel Pump 101 (zymurgist)
If the gas comes in contact with the teflon tape it would just eat through it anyway. At least thats what I guess it would do (since i'v never actually done it). Just tighten it down pretty snug and it should be fine.
Thread Starter
Drifting
Joined: Sep 1999
Posts: 1,439
Likes: 1
From: Hagerstown MD
Re: Fuel Pump 101 (77Dream)
Thanks guys...
I figured I might not need the tape on the pipe thread end... after all, the factory didn't use it. The reason I asked in the first place is that I had fuel leaks after I replaced the fuel pump (that was on the last motor :D ). I wasn't sure whether the leak was coming from the flare end or the pipe thread end. Now that I've got the elbow off, I can see that the flare end appears to be damaged. I'm guessing that's what caused the fuel leak... so I'm going to buy another elbow and take it from there. (Already bought a brand new stainless pipe which goes to the carb.)
I figured I might not need the tape on the pipe thread end... after all, the factory didn't use it. The reason I asked in the first place is that I had fuel leaks after I replaced the fuel pump (that was on the last motor :D ). I wasn't sure whether the leak was coming from the flare end or the pipe thread end. Now that I've got the elbow off, I can see that the flare end appears to be damaged. I'm guessing that's what caused the fuel leak... so I'm going to buy another elbow and take it from there. (Already bought a brand new stainless pipe which goes to the carb.)
Safety Car
Joined: Jun 2001
Posts: 4,004
Likes: 2
From: Severna Park Md
Re: Fuel Pump 101 (Eddie 70)
I used teflon tape. That was a mistake. It leaked and I never could get it to quit leaking. I took the tape off and it hasn't leaked since. That is my experience.
Thread Starter
Drifting
Joined: Sep 1999
Posts: 1,439
Likes: 1
From: Hagerstown MD
Re: Fuel Pump 101 (77Dream)
If the gas comes in contact with the teflon tape it would just eat through it anyway. At least thats what I guess it would do (since i'v never actually done it).
Melting Slicks
Joined: Jul 2002
Posts: 3,128
Likes: 3
From: Deltona (son of Deland and DAYTONA) FL
Re: Fuel Pump 101 (zymurgist)
Not knowing any better, I used the regular teflon tape that plumbers use. I haven't had any leaks, but must've got lucky tightened it the right amount.
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Thread Starter
Drifting
Joined: Sep 1999
Posts: 1,439
Likes: 1
From: Hagerstown MD
Re: Fuel Pump 101 (warhovs)
Hmmm... I tried that and still got a leak. Tightened the brass fitting one more turn and the pipe threads seemed to seal but I had to use so much torque that I deformed the opening for the flare side (ever so slightly, I could still thread the flare nut into place).
Thinking of starting over with a new brass fitting... should I use anything at all in the threads to keep it from binding as I torque it down? The last one I tried, I used nothing at all in the threads.
Thinking of starting over with a new brass fitting... should I use anything at all in the threads to keep it from binding as I torque it down? The last one I tried, I used nothing at all in the threads.
Instructor
Joined: Jul 2002
Posts: 132
Likes: 0
From: Virginia Beach Va.
Re: Fuel Pump 101 (zymurgist)
Try using Permatex brand thread sealant, it is not affected by gas. Get it at most any auto parts store (Autozone) Make sure it's sealant and not antisieze.
Should do the trick.
Should do the trick.
Instructor
Joined: Jul 2002
Posts: 132
Likes: 0
From: Virginia Beach Va.
Re: Fuel Pump 101 (zymurgist)
No, but I guess the thread sealant could be used on any bolts. It comes in a hi-temp and hi-strength types.
Permatex PN. 56521 (hi-performance)
PN. 59235 (hi-temp)
Permatex PN. 56521 (hi-performance)
PN. 59235 (hi-temp)
