fuel pump pushrod access plug question

[bluefury361]

yes a clear gas filter - is that where the heat is getting in? should I ditch it? I have a length of gas hose I could swap and try...

If you have a clear gas filter you can watch it to see if it goes empty.... If not then the float may be set to low.

and - whats the pickup in the tank? I don't know what you mean.

The pick-up is the tube in your tank that picks up the fuel. It's a part of the sending unit and has a "sock" on the end which may be clogged. Once I used orange RTV to seal my sending unit to the tank on a 64 300, big mistake....! It found its way into the tank and after driving for awile would find its way into the fuel pickup and stop the fuel flow.
After sitting awile it would drop back into the tank and the car would start and run again..... Until it found it's way back into the pickup. It took a couple of rollback rides home before I figured that out.

 

[saylor]

any thoughts on why it would work when the engine is cold but not when the engine is hot ?

 

[detmatt]

Read the above post Will is answering your question. The pick-up comes out very easy, just make sure you have less then half a tank before you remove the locking ring.

 

[1966newport]

because the choke is partly on?

 

[commando1]

if you have a clear gas filter you can watch it to see if it goes empty.... If not then the float may be set to low.

bingo!............

 

[saylor]

I don't get it - I have done nothing at all to the tank or unit or anything. it is suddenly too low ?

and how would a carb choke make the gas stop flowing from the fuel pump ?

 

[saylor]

well, i guess either issue - a sock or sending unit or float - will be eliminated if I run from a gas can laying on the driveway. im going to get gas and a length of hose right now a soon as it stops raining, bring the car up to temp, then unhook the tank line and move it to a gas can. I guess this will tell us stuff.

 

[saylor]

. .. also - I was thinking about all these posts (I really do appreciate the help - I just don't agree with them yet!) and I have the choke totally unhooked - yesterday I unhooked the line and plugged it with a small bolt like it was on the old carb, and removed the filler cap lid, before all this last round of testing.

 

[saylor]

well, we had rain all night, so its a cool morning here in dallas (68*F this morning) and i cant get my car past 170*.

and - it has not starved for fuel.

its just idling away. rough. but idling. i dont know how to adjust my new carb :/


so , anyways, is there anything tankside that would be affected by engine heat and screw my fuel delivery?( sending unit, pickup, whatever else is back there).

 

[saylor]

i even let it heat soak (engine off sitting there) up to 190* then started it.. it just went back down to 170* real fast never starved fuel

 

[saylor]

damn.. rained out again. we need the rain. but damn. i need my car moving down the street.

 

[saylor]

fuel pump pushrod allen bolt removed, and pushrod pooking out...

 

[saylor]

original pushrod and new comp cam #4646 pushrod . . .same length . .. sigh. . .I ended up putting the old one back in.

 

[saylor]

based off todays tests, it has to be a heat issue. its cool out today, and it never starved for fuel. Engine temp never got above 170~ while running. When I let it sit there and get hot (not running) the temp showed 190*. Started right up, and immediately started cooling back towards 170*. I also tilted the fuel filter a little uphill on the exit side, so any air/vapor/etc will try to go towards the carb (hopefully) and out of the system. I also also wrapped the fuel filter completely and rest of the line up to the carb in the summit 1000* heat sleeve stuff, so now it is wrapped from the FP to carb totally.

 

[saylor]

today it was in the 90s somewhere. Car ran out of fuel. this is effing stupid. we removed the glass see thru filter and ran solid piece of hose from pump to carb, nada. im gonna block off the mechanical fuel pump and put an electric unit in. anyone need a 2 week old fuel pump that's never been out of the driveway?

 

[65Fury440]

today it was in the 90s somewhere. Car ran out of fuel. this is effing stupid. we removed the glass see thru filter and ran solid piece of hose from pump to carb, nada. im gonna block off the mechanical fuel pump and put an electric unit in. anyone need a 2 week old fuel pump that's never been out of the driveway?

Did the clear filter have gas in it when you removed it? If it did, you know that it is carb related.

 

[detmatt]

Did you ever try pumping gas out of a jug under hood?

 

[saylor]

thanks for the reply. no, the clear gas filter was/is empty. as the engine temp hits 185+, you can watch the filter and see the gas level disappear going from totally full no air bubble to bone dry empty. Then finally, you can see an occasional spurt of gas come in from the pump. by then, the filter is totally empty and the car struggles to run. I put a video of it here somewhere on this forum.

if I turn it off and wait until it cools down, about 3hrs or so, looking at the filter again, it will be about 1/4 full of really yellow brown pee looking gas. from what I can tell this is gas that has condensed back down from vapor. Running the car at this point, the gas filter will quickly fill up with nice clean clear gas and at full pressure.

I don't know if you've read the previous posts, but ive changed everything from the hard fuel line at frame forward. New rubber line from frame to FP, new FP, checked FP pushrod its perfect, new rubber line to filter, new filter, new carb.

We also tried without the glass filter, just 1 rubber line from FP to carb. It wasn't over 90* that day, so it worked, but im calling that an invalid test. my car never got over about 170* that day, so it never got hot enough to really test (190*+).

help me before I break down and put an electric pump on this beast

 

[saylor]

ya it quits pumping. I guess the pump is too hot ?

 

[saylor]

summit says the pump is the pump, it works cold or hot. is what they said when I asked to return it.