WTF? Fuel wont stop flowing

So I had a leak in the line from the tank (new) behind the seat to the stainless line (brand new) that feeds to the engine. I fixed that only to find the fitting from the line to the fuel pump (which is also new) now leaks.

But here's what confuses me:
The fuel pump is mechanical, so even after I shut the engine off, it keeps leaking.. I have to DISCONNECT the fuel tank before it'll shut off..

What is this and how do I address it?

Thanks.

 

Do you have a vent for the fuel tank ??

 

Is it the braided stainless with AN style fittings? If so, pressure test your fittings to make they are put together correctly. If hard line - bad flare?

http://www.summitracing.com/parts/FRA-900666/

 

If your tank outlet is higher than your fittings that are leaking I'd say gravity.
my $ 0.02

 

Bahumut....the mech fuel pump has a weep hole, that is placed there during manufacture, which is intended to leak if/when the pump diaphragm goes bad (ruptures). If the fuel pump is leaking from this weep hole, the diaphragm is bad. The fix is to replace the fuel pump.
If the fitting is leaking, it may have been tightened to tight in the aluminum or pot metal fuel pump body, cracking the fuel pump body, or the fitting seal surface could be damaged causing the leak. I usually use the white thread sealer on NPT threads when installing fittings in the pump housing.

BOutlaw

 

Its syphoning. Fix the leak and call it good.

 

Thanks for the replies. I checked the fuel pump and i'm thinking it is indeed cracked from over tightening (little bubbles of fuel appear after engine shutoff). I guess I gotta run back to LMC next weekend

 

Here's an idea you might want to use so you can shut off your fuel and prevent siphoning. Solder a small radiator petcock shut off in the line as shown below. Makes it easier when changing pump, filter, etc.

 

I recommend a fuel shut for the same reason as above and more. I fuel shut is probably the most effect anti-theft device you can put on an older car.
1) It can be easy access yet hidden from sight
2) Some one hot wires your car and gets it started, a shut off will allow enough fuel to ge about a block away then the car runs out of fuel leaving the thief (and your car) out in the middle of the street somewhere a block away, and the thief unwilling to take the time to find the problem fearing attention of the broke down vehicle will cause the police to arrive...
At least you get your car back....saved me a lost 55 Chevy belair twice in 28 years, once at a motel at an overnight show and the day I stupidly took it to church one Sunday morning

 

I have seen new brass fittings with a line down the threads. Fuel leaked along that line. In the old days, we never used sealer on brass. Now its required on some fittings. The brass costs four times more now and some of it is junk.

 

The fuel cut-off is a superb idea. I've done it on bikes; never thought to do it on the truck.

I had the older fuel pump laying around in the basement, BTW. I threw that back on and of course, no leaks. Problem now is that the throttle return spring is worn out so whenever I step on the gas, the pedal doesn't return all the way back up, but that's another story for another time.

 

Hey, it's hot rodding. Fix one thing and then get ready to fix something else. All part of the fun.

 

That belongs on a T-shirt...