Alright here's the deal..

I've got an electric fuel pump on the F1 which I can hear running but it's really noisy like it's just sucking air. It also gets quite warm leading me to believe it's not getting any fuel coming through...

Have you guys seen the old tanks or lines get clogged? I imagine the blockage must be between the tank and the suction side of the pump since if it was on the outlet side the pump would prime and quieten down. Correct?

I just can't imagine the tank being advanced enough to have a in-tank filter that could clog or anything.... anyone got any insight to it?

I'm not liking the idea of having to rip out the tank and all the lines...

 

You're right, there is no in tank filter. The gas tank in your truck has a bottom outlet, and anything or everything that may be loose, debris, rust, etc., can and will clog the line going out there. Combine a rusty tank with old, rusty lines, and you have the makings of a clog. It's a very common occurence. You can start by undoing the line at the bottom of the tank and see what happens. There should be a petcock there you can close to keep gas from dumping on you as you remove the line.

 

Has your tank ever been cleaned? Sixty-one years is a long time for rust to accumulate...just finished mine. In the process I found out this was it's second (at least) cleaning and sealing!

 

You didn't say, but I would suggest having a filter between the tank and the electric pump and one between the electric pump and the carb. Protection!!! Have a great day,chuck

 

That's what I was thinking.

Thanks for the quick replies guys... got some tinkering to do I guess...

 

If your electric pump is more than a foot from the tank, it probably won't work. I found this out after I mounted my new electric near where the old mechanical used to be, and I believe someone on this forum confirmed my issue. Electric pumps are meant to push, not pull.

The other thing I've found is that if I let it sit for a long time, I'll have to pull the downstream hose off the pump for a second, let it prime itself, then after a little fuel has shot out (on me), I re-connect the tube. I do not understand this, and have a new fuel pump to install as it doesn't seem right.

LC

 

Are we talking about a in cab tank? I was under the impression electric fuel pumps need a return line to the tank. I would think the downward pressure of the fuel out the bottom of the tank would be enough to provide input pump pressure. I know lines coming out of the top of the tank need a priming pump prior to the fuel pump. Electric pumps need to keep fuel moving. My opinion. chuck

 

That's true of high pressure, fuel injection pumps, but not so much for your garden variety electric. They're only making around 6 psi, and typically will bypass inside themselves when the needle seats and the line is fully pressurized to that low level. Some pumps, like big Holley racing pumps will utilize an external regulator near the carb to do that job, but the result is the same, and even they don't need a return line.

 

I am running a low pressure Holley fuel pump on my 68 Mustang and the installation instructions state that the pump should be mounted below the fuel level in the tank to be gravity fed, then the pump will push to the carb.
w

 

Wayne. Thanks for the correction. chuck

 

I called around a couple of shops here locally to have my tank cleaned and sealed, it was gonna cost me $200 dollars! I would just buy a new tank for that kind of money, and then its new and trouble free.
Of course I am not using my in cab tank anymore but....

 

POR 15 worked good on my stock tank. Beleive me it had 60 years of rust in it. I have a glass inline filter and i have only saw a little rust in it after the por 15 cleaning /sealing product. Good for another 60 years !!!!! lol