My truck will turn over very strong but will not crank. it cranked one time then died immediatly. 30 min later it cranked and ran for about 5 min then died again. any ideas, alternator, fuel pump.

gas v10 motor, full of gas, new spark plugs.

 

Auto zone says it may be the alternator, is that possible

 

I had the same problem with my 7.3 engine, dealer replaced the CPS (camshaft position sensor) worked well since. I can not say that is the cause with gas engine.

 

If it was the alternator, it probably wouldn't start. I would start with the fuel system. Filter, clean the IAC valve, then off to the pump.

Mine did something similar right after I got it, although it wouldn't run. It would crank and TRY to start, but wouldn't. It was the fuel pump.

Good Luck!

 

i have got a 99 f250 5.4.... it will start but dies 30 sec latter unless u keep gas to it ....any thoughts

 

CEL illuminated or any codes?

 

I would think IAC. Did it all of a sudden happen or progressively get worse?

 

I have not had it hooked up to a computer but its not flashing any check engine

 

To OP, I'd check fuel pressure. Could be fuel pump or filter etc. To Toxic, I've had codes show up when there is no CEL on (superchips flashpaq). Although the folks at Autozone, swear they are only for when that light is on. I'd scan it if you can.