In my 1986 f250 changed the fuel filter between carb and fuel pump ran fine but noticed i was leaking fuel due to the fact i kinked the line. well I cut out the area that kinked with a hand saw and replaced with a flexible fuel line. Now the engine barely starts and eventually stalls and dies! What can it be now!???? help please!

SOURCE: 1988 F-250 460 engine stalls when dribing down the road

On older, carbureted engines, cold stalling (and hard starting) is most often due to an automatic choke that is sticking, misadjusted or broken. Cleaning the choke mechanism with aerosol carburetor cleaner may free up the choke allowing it to work properly again. If the choke housing as an electrical heating element, the element may not be receiving voltage when the key is on, or the element may have burned out (check resistance with an ohmmeter).

Other causes of stalling with a carburetor include an idle speed adjustment screw that is set too low (turn screw to increase idle speed rpm). The engine may stall if the idle fuel mixture screw(s) are not adjusted correctly or the idle mixture port(s) are dirty or clogged with fuel varnish deposits (clean the carburetor and readjust the idle mixture screws for smoothest idle). Stalling can also occur is there are vacuum leaks in the carburetor, under the carburetor (bad base gasket), or any vacuum hose connections to the carburetor or intake manifold

SOURCE: 98 expedition starts then after 15-20 seconds engine dies..

Replace the idle air control valve. Mine just did it today the 15th of August. I replace the Idle air control valve and problem solve. I have a 2000 Expedition 5.4 liter.

SOURCE: 2005 ford F250 6.0 litre turbo diesel won't start.

Same thing happened to my F350 6.0 L 2005. The dealer replaced the high pressure fuel pump on the engine. It is currently working, but one month later the EGR cooler got a leak and it was replaced by the dealer. The internet states these are very common problems with the Ford Deisel. The fix is NEVER BUY A FORD AGAIN. I got taken, How do you feel.
A former life long Ford loyal Customer.

SOURCE: Engine wont stay running. Please help.

change the filter first. IF the pumpwas bad it wouldnt start at all. It could be going bad but the only way to really test it is to pull your gas tank and at that rate you may as well replace it.

you could have a clogged injector causing the lack of fuel as well. you can try injector cleaner, Lucas is my personal preference I use it at every fill-up. 4-6oz per tank of gas depending on your tank size.

SOURCE: I'm replacing fuel pump on 2000 Ford F250 7.3

OTC Set, Fuel Line Disconnect Tool
OTC Part Number 7660- there are other tools that compress these fittings available at most auto parts stores.