1964 Barracuda

[ryan1964]

I have a 1964 Barracuda 318 4 barrel 4speed I have replaced the whole fuel system and I'm having problems with getting fuel after it warms up the filter goes from half full to empty is anyone else having this problem and what was the fix thank you

 

[junkyardhero]

i had a similar issue and it was the fuel pump giving up the ghost.

also, check that your tank is properly vented.

 

[ryan1964]

I have put 3 pumps on I the last week just to be sure and even if you take the cap off It doesn't change anything

 

[ryan1964]

It has factory manifolds on it and it only runs at 180 degrees I can't see how it would boil the fuel in the pump

 

[64mopar]

Is it a new tank and pickup?

 

[ryan1964]

Is it a new tank and pickup?

Everything

 

[junkyardhero]

tell us more about the set up. be extremely detailed.

 

[ryan1964]

318 stock manifolds edelbrock intake and carb new tank sending unit metal line for the car new pump maybe 3-4 inches of rubber connecting everything the filter is full or half full when it's cold after it gets warm the filter is empty when it's cold it drives fine after it warms up it will run out of fuel but still run unless you put a load on it I will take a video of it when I leave work and when I get home

 

[junkyardhero]

that sure as heck sounds like a fuel pump...

i'd go back over the work and check to be sure you didn't kink something or fold the sock on the end of the pick up over.

i had an issue one time where once the car got hot the fuel line would get just soft enough to pinch closed a little bit and close it down to just a dribble of fuel.

have you checked the fuel output from the pump once it gets warmed up?

here's a straight wild grasping at straws levels of galaxy brained think: what if the fuel pump eccentric is fine when it's cold, then as it heats up, things expand and it's slipping?

 

[ryan1964]

that sure as heck sounds like a fuel pump...

i'd go back over the work and check to be sure you didn't kink something or fold the sock on the end of the pick up over.

i had an issue one time where once the car got hot the fuel line would get just soft enough to pinch closed a little bit and close it down to just a dribble of fuel.

have you checked the fuel output from the pump once it gets warmed up?

here's a straight wild grasping at straws levels of galaxy brained think: what if the fuel pump eccentric is fine when it's cold, then as it heats up, things expand and it's slipping?

That would be wild I have changed the pump three times in the last week all of the rubber is new and doesn't seem to be collapsing

 

[junkyardhero]

new doesn't necessarily mean "good", so it might test fine till it gets hot and craps out on ya.

i'd run it and pull the hose and see what's up. at least that'll tell you if your problem is blockage after the pump, or supply to the pump.

if it's supply to, eliminate everything by running an external feed (zip can, nurse bottle, lawn mower tank bungee'd to the fender), if it still won't supply fuel then you know it's the pump. so then it's down to whether the pump is bad or the operation of the pump is bobo.

 

[64mopar]

When did the problem start?

What did you change before and after the problem started?

 

[ryan1964]

Before and after

 

[ryan1964]

What did you change before and after the problem started?

Good question I just built this car everything is new and I just noticed it

 

[64mopar]

Disconnect fuel line from carburetor, crank engine(if it will start, let it run)and pump fuel into a container.
Observe fuel flow for quantity and consistency.
Let us know the results.

 

[AJ/FormS]

You said that you put new jumpers in the supply line.
Did you re-install the factory spring-clamps? or
Did you install gear clamps?
If the latter, then those screw-clamps bunch up the hose, right at the screw, which usually allows the fuel pump to suck air. So you think the pump is bad, but as you found out, it's not.
The cure is to put a second clamp on every end of every jumper, with the screw head rotated 180 degrees, AND
I usually put a bubble-flare, a little ways back from the end of the line, kindof like a hose-barb, so the line can't accidentally come off. I know it's on the suction-line, but I don't like troubles in the fuel-system. With the Bubble-flare, the line tightens up well enough that really, the clamps don't even have to be there.
And on my car, I installed a Life-time EFI-filter, at the back, yes, on the suction side. It's been there since year 2000. So then, From pump to the dual-feed on the 750DP carb is a one piece steel line that I fabbed up, and I never see air, lol. Where the line is jumpered to the dual-feed, Yeah, I installed a jumper there, cuz it makes it easier to pop the carb off.

BTW
If the rear jumper is sucking air,
and you don't realize it, then;
Every fuel-pump test you do will point to a bad pump,
so don't feel bad, every guy in this thread that points to the pump, has also been fooled....... if it's sucking air.

 

[wawarnick]

Have you swapped out the filter, or is it the same one with all the fuel pumps?

 

[ryan1964]

You said that you put new jumpers in the supply line.
Did you re-install the factory spring-clamps? or
Did you install gear clamps?
If the latter, then those screw-clamps bunch up the hose, right at the screw, which usually allows the fuel pump to suck air. So you think the pump is bad, but as you found out, it's not.
The cure is to put a second clamp on every end of every jumper, with the screw head rotated 180 degrees, AND
I usually put a bubble-flare, a little ways back from the end of the line, kindof like a hose-barb, so the line can't accidentally come off. I know it's on the suction-line, but I don't like troubles in the fuel-system. With the Bubble-flare, the line tightens up well enough that really, the clamps don't even have to be there.
And on my car, I installed a Life-time EFI-filter, at the back, yes, on the suction side. It's been there since year 2000. So then, From pump to the dual-feed on the 750DP carb is a one piece steel line that I fabbed up, and I never see air, lol. Where the line is jumpered to the dual-feed, Yeah, I installed a jumper there, cuz it makes it easier to pop the carb off.

BTW
If the rear jumper is sucking air,
and you don't realize it, then;
Every fuel-pump test you do will point to a bad pump,
so don't feel bad, every guy in this thread that points to the pump, has also been fooled....... if it's sucking air.

It has gear clamps on it I just changed the pump and check all the clamps everything is tight still doing the same thing so tomorrow I'm going to stick a hose in a can and run it and see what happens and if it is still doing it I will pull the timing cover and check and make sure that it's not slipping on the cam I'll keep everyone posted thank you to everyone that has responded

 

[ryan1964]

Have you swapped out the filter, or is it the same one with all the fuel pumps?

It's just the clear plastic filter it's new

 

[dogbreath]

suction leak

 

[junkyardhero]

It has gear clamps on it I just changed the pump and check all the clamps everything is tight still doing the same thing so tomorrow I'm going to stick a hose in a can and run it and see what happens and if it is still doing it I will pull the timing cover and check and make sure that it's not slipping on the cam I'll keep everyone posted thank you to everyone that has responded

i only threw that out there as a wild-*** out of the box from mars kinda guess. one of those: if you've eliminated all of the probable, then only the impossible remains.

things to check: are you sure you have the right pick up/sending unit in the tank? are you sure it's in the right location and the sock isn't boogered up.

i know you've replaced it, but i can't tell you how many times i've found the pick up to frame line bent funny, collapsing cuz it's old or just kinked or whatever else may, could or can befall that thing. so check it again.

how much gas you got in the tank? if it's under a 1/4 imma come over there and thrash you with a well used fan belt.

test it with at least a half tank. if it runs fine at 1/2 a tank cold and warmed up, but not at say, 1/4 or less then you've got a whole 'nother problem, but at least you're not chasing your *** on phantom symptoms. in that scenario, you know that your fuel delivery is fine, but your fuel pick up at a specific level is not; rather than just a nebulous: i have a fuel delivery problem.

sounds like you're on the right track. do it to it amigo!

 

[ryan1964]

Lmao full tank

 

[ryan1964]

i only threw that out there as a wild-*** out of the box from mars kinda guess. one of those: if you've eliminated all of the probable, then only the impossible remains.

things to check: are you sure you have the right pick up/sending unit in the tank? are you sure it's in the right location and the sock isn't boogered up.

i know you've replaced it, but i can't tell you how many times i've found the pick up to frame line bent funny, collapsing cuz it's old or just kinked or whatever else may, could or can befall that thing. so check it again.

how much gas you got in the tank? if it's under a 1/4 imma come over there and thrash you with a well used fan belt.

test it with at least a half tank. if it runs fine at 1/2 a tank cold and warmed up, but not at say, 1/4 or less then you've got a whole 'nother problem, but at least you're not chasing your *** on phantom symptoms. in that scenario, you know that your fuel delivery is fine, but your fuel pick up at a specific level is not; rather than just a nebulous: i have a fuel delivery problem.

sounds like you're on the right track. do it to it amigo!

The sending unit is for that car and the filter on the pickup is a barrel not a sock and I never drive around on a empty tank because the gas guage doesn't work lol

i only threw that out there as a wild-*** out of the box from mars kinda guess. one of those: if you've eliminated all of the probable, then only the impossible remains.

things to check: are you sure you have the right pick up/sending unit in the tank? are you sure it's in the right location and the sock isn't boogered up.

i know you've replaced it, but i can't tell you how many times i've found the pick up to frame line bent funny, collapsing cuz it's old or just kinked or whatever else may, could or can befall that thing. so check it again.

how much gas you got in the tank? if it's under a 1/4 imma come over there and thrash you with a well used fan belt.

test it with at least a half tank. if it runs fine at 1/2 a tank cold and warmed up, but not at say, 1/4 or less then you've got a whole 'nother problem, but at least you're not chasing your *** on phantom symptoms. in that scenario, you know that your fuel delivery is fine, but your fuel pick up at a specific level is not; rather than just a nebulous: i have a fuel delivery problem.

sounds like you're on the right track. do it to it amigo!

i only threw that out there as a wild-*** out of the box from mars kinda guess. one of those: if you've eliminated all of the probable, then only the impossible remains.

things to check: are you sure you have the right pick up/sending unit in the tank? are you sure it's in the right location and the sock isn't boogered up.

i know you've replaced it, but i can't tell you how many times i've found the pick up to frame line bent funny, collapsing cuz it's old or just kinked or whatever else may, could or can befall that thing. so check it again.

how much gas you got in the tank? if it's under a 1/4 imma come over there and thrash you with a well used fan belt.

test it with at least a half tank. if it runs fine at 1/2 a tank cold and warmed up, but not at say, 1/4 or less then you've got a whole 'nother problem, but at least you're not chasing your *** on phantom symptoms. in that scenario, you know that your fuel delivery is fine, but your fuel pick up at a specific level is not; rather than just a nebulous: i have a fuel delivery problem.

sounds like you're on the right track. do it to it amigo!

It is the sending unit for that car the filter on it is the barrel style and I don't drive on empty because the guage doesn't work lol

 

[Oldmanmopar]

The sock is sucked up against that new sending unit tube. Take it off . Cut the end of the tube at a sharp angle. bend the very tip down a tad.

 

[ryan1964]

new doesn't necessarily mean "good", so it might test fine till it gets hot and craps out on ya.

i'd run it and pull the hose and see what's up. at least that'll tell you if your problem is blockage after the pump, or supply to the pump.

if it's supply to, eliminate everything by running an external feed (zip can, nurse bottle, lawn mower tank bungee'd to the fender), if it still won't supply fuel then you know it's the pump. so then it's down to whether the pump is bad or the operation of the pump is bobo.

Ok so I have hooked it up to a can and it's doing the same thing I hooked it up to a vacuum guage and it's pulling good vacuum but it's not pulling fuel or if it does it goes in spurts