I have an 85 F250 with dual tanks. When I start it, it runs for a few seconds and then dies. I put a new fuel filter on, and it seems to pump plenty of fuel out of the line when cranking and still having the problem. Does anyone have any suggestions of what could be wrong?

 

Take the aircleaner off, and get it running. When it dies, jump up in the engine compartment, andwhile looking down the carb throat, push the throttle back. You should see two strong streams of gas pour into the engine. If you don't you still have a fuel problem of some sort.

 

What size of engine?

There is sometime a filter on the black canister with two inlets and one outlet, located on the frame rail by the transfer case.

 

Does your truck have the hot fuel system on it.......Hot fuel system came on 460 if you have it do a search on this site for hot fuel system and it will show you all your power relays and how your fuel pump power goes through your oil pressure sending unit.....

 

I have found the problem on my truck. The valve for the front and rear tanks had a crack in it and was letting air into the line. Thanks for the suggestions.

 

I have never heard of a Hot Fuel System. Can you give me more detail? I do have a 460.

 

Apparently Ford had a problem with vapor lock with the 460's, or thought it could be a potiential problem. I have a theory that a lot of the 460 vans and pickups were designed for commercial service and delivery, where they could be idling a lot in hot summer weather.

What it consisted of was electric fuel pumps in the tanks instead of a mechanical fuel pump on the engine. It also had a special tee fitting at the carb, with a return line to the tank.

At idle, the engine does not use much fuel, so the fuel can sit in the lines and start to boil. This system with the special tee let a portion of the fuel go back to the tank all the time. This kept the fuel moving, where it could then go back and cool off in the tank.