I need a diagram of the fuel system from a 69 F250 Camper special. I am having fuel problems and it seems to be related to the fuel lines, not sure though.
Thanks
Brett

 

Can't help you with a diagram...but if you are having fuel starvation issues....have you changed all the rubber lines yet?? They have a tendency to collapse from age and you can't suck fuel thru them.

 

Brett,

My grandfather and I chased fuel on his pickup for years. Finally I bought the truck from him and turned out the issue was the ignition harness. Seems all of the acc and a/c run throught that poor switch socket. Heat and cracking from the years killed it. When the truck ran for a while the socket would expand so much the ign contacts would come out of contact. We repl 3 fuel pumps, Rebuilt the holley a few times and chased all of the fuel lines through the dual tank switch to the tanks themselves.
I wish he were still here when I found it. Really bugged him.
Just a thought.
Peace

69 f250 camper special. 428 Cobra jet, C6, 4.10 rear ls, dual-tanks, ac, pb, ps. Pretty much everything you could get. Oh yeah all of that cool chrome and that ranger emblem in the middle of the grill. It's for sale.

 

The stock fuel system is pretty stright forward, mechanical pump, steel lines with a drop out the bottom of the cab and then forward along the frame to the pump. If you have stock dual tanks, there is a manual selector valve on the floor, and an electric switch under the dash, to switch between senders.

The fuel pick up on my 69, got soem kind of a light brown / tan deposit on the inside of it that constricted it down to less than an 1/8th of an inch diameter, about a year after I started using unleaded fuel.

The truck would idle fine, and run okay for a short distance. But, as soon as I got in the throttle, it would starve out and misfire.

 

This is what mine is doing. What is the best way to flush the system out? Also, is there a good way to check the selector valve in the floor by the seat?
Brett

 

I don't know of an "easy way", you just have to take things apart and check them, in type of sytematic way. If there is fuel in the tanks, it can get pretty messy.

Before you start ripping things apart though, trace the whole set of lines, to make sure nothing is dented, bent, kinked or collapsed.

If you have dual tanks, does it happen on both tanks?

You might want to get a combination, vacume/ pressure gauge, and check the pump outlet pressure.

If you disconnect the lines as they go into the two way valve, the gas should run out pretty quickly.

 

Well, I don't think that the tank switch is working properly. I think that I have the main tank working but when I switch to the secondary tank, it does not seem to work. the gauge switch shows empty when I know that the tank is full.
Brett

 

The gauge, and manual valve are totaly seperate. The manual valve is a cone valve so it is pretty rare to have a failure in it. The pickup in the tank could be bad. If the problem is only with the auxilary tank, you probably have it narrowed down to somewhere between the manual valve, and the tank pickup.

The other possibility is the fuel pump. The difference in the suction required could be enough to starve the pump.