ford 6.9 diesel fuel delivery problems
 

have 6.9 in 87 f350 truck was running fine then stalled and would not start.had fuel in tanks after sitting for a week i got it to start it ran for about 10 minuites then stalled again removed fuel line coming from mech. pump to filter cranked over and a little came out of line but it did not seem like much.could it be the transfer pump on engine block is there a pump in fuel tank or just ice i put fuel anti freeze in tank. i dont understand truck was running fine before it stalled please help

welcome to diesel bombers could be your transfer pump if like you said not much fuel coming out when you crank it could be the line between your tank and pump but if it was running fine before it stalled do a double check on your transfer pump :humm:

thanks for the info another question before i buy pump are there any electric pumps between tanks and transfer pump or does it just go to transfer pump

Unless someone put in an electric pump, there is only a diaphram transfer pump on the block of the IDI trucks...no inline or tank pump.

There is a vane pump in the injection pump though.... If you took the line off at the filter head you should have a pretty good flow of fuel coming out.

how much fuel is in the tanks? duel tank or single? could also be a crack in hard line running down framrail letting air in.

yeah 2 tanks front full rear quarter full i replaced rubber line from steel line to transfer pump truck started and ran for a few minuites then throttle started to feather and it stalled going to remove steel line tomorrow and replace if bad thought transfer pump might be bad but i dont know ill try steel line then go from there thanks for help

replaced fuel transfer pump put rubber line into fuel can truck ran fine when i tied into fuel tanks truck stalled there are no cracks in line coming from transfer block valve on the frame so i am wondering if that valve is bad ? priced one from ford kind of expensive. does anyone make one aftermarket? and i may just by pass valve by cutting lines and if that does not work i have to drop tanks anyway any advice

I just had the same problems mine turned out to be the switching valve. (from tank to tank) You can get bypass tubes from the auto parts store. one more thing to check is if it still has the factory water separator. Good luck.

factory water seperator is gone ialso found an aftermarket switch valve for 1/3rd the price that ford wanted thank you for advice