My 89 f350 with a 460 runs great for 10-15 miles, after its good and warm it will cut off. I put it in park and it will crank back up everytime but will cut off every couple miles after that. I put a new cap and rotor on it but dont want to go any further until i get some advice. Any would be greatly appreciated.

 

does it shutter or anything? or does it run strong tell it cuts off?

when it does cut off does it gotta cool down or will it fire right back up?

 

It sputters and eventually cuts off, it will start right back up but takes longer the more times u do it. I also just tried a new coil with no luck, it runs great until its good and warm

 

could be fuel... sounds like it anyways

 

Okay, i tried pulling the fuel line off between the in tank pump and the high pressure pump on the frame rail, The high pressure pump comes on with the ignition but the in tank pumps are not putting any gas through the lines. So would anyone agree that the high pressure pump is pulling enough gas to start the engine and let it idle, but the intank pump isnt working so it will not stay running under acceleration. The only iffy thing is its weird both intank pumps stopped working at the same time. Could it be something simpler, and i have replaced the fuel relay..