71 F100 302/3spd man fuel issue

[derekm803]

Hey. Just picked up a 71 model, specs in the title. When I fire the thing up it will sit there n run for about 10 mins then stop pulling fuel up til it starves and dies. Has a new manual fuel pump and a new fuel filter at the carb. I was running it off the tank and thought I had trash in the tank stopping off the fuel pick up but this morn I drained the tank and hooked it up to a 1 gal jug under the hood. It does the exact same thing now as it did pulling from the tank. I have a clear plastic filter between the tank and the fuel pump. At cold start it fills the filter up but as it sits there warming up the level in the filter slowly starts going down. Once it gets warm n stops running, im not pulling any new fuel into the filter when I spin it over to crank it. I can see the fuel going into the filter and its just a trickle. Since im not pulling from the tank anymore that rules out the rubber lines collapsing. I don't want to say the new pump is faulty either because while I was still pulling from the tank I tried it wit 2 electric pumps and the new manual pump with the same results. Could the needle n seat in the carb be sticking when it gets warm stopping it from pulling up fuel? Would that cause the filter before the pump to run empty? The heads have been recently put on the engine(they are perfectly clean with fresh paint while the block is dirty and they have new bolts on the exhaust manifold) Is there a heat shield under the intake to protect the carb that possibly got left off? Grasping at straws at this point but my focal point has changed. I am kinda glad the tank doesn't absolutely have to come out now tho. Thanks in advance.

[71cc]

First of all replace the filter or remove and test. I just went thru this. Water/ethanol/jelly crap plugged the bronze filter and would not pass a drop of gas thru it. Otherwise filter was beatiful, no rust or particulates. I blew it out and all was fine.

I had a car with a glass filter do what you describe but I believe it was boiling the fuel off into a vapor inside the line. I have restricted the heat crossover in my intake, insulated the fuel line, and put heat sheild under the carb. In the summer my idle would get rough while sitting at a traffic light. It was boiling the fuel in the carb and sucking it thru bowl vent making idle extremely rich.

[derekm803]

Just bought that inline filter last week but I'll try another one it did pick up a little sediment from being hooked to the tank. I really don't believe it's having enough time to get hot enough to boil anything, I just saw that on other posts. Like I said it runs 10 mins top before it starves out of fuel. That's barely enough time to get to full operating temp, I believe.