no start without either...
 

so my buddy has a 1 ton and you can start it with either and itll start and run fine the rest of day BUT if you dont use either itll kill the batterys 3 times over and it will not start new fuel pump new fuel filter and like 30 gal of fresh fuel it did sit for like 3-4 years with like an 1/8 tank we got most out put 2 things of diesel 911 in with the new fuel... im at a loss on how you can start with either and be totally fine after that but no either no start... you guys got any ideas or experiences similar?

need to know fuel pressure. scan for codes?

I am having the same sort of problem. Trying not to use eather tho... I just got off the phone wh a guy who told me to check the seal where the fuel filter goes. He said if it has any damage to it then air will get in and make is a pain in the rear to start. Hopefully I can get a file pressure faucet in the next day or 2.

I'll c if we can get a gauge on it, what pressure should I be lookin for? Could the regulator on the pump possibly be bad or clogged maybe?

Have you tried bumping the starter, and letting the fuel pump run for 25-30 seconds before cranking? It should push any air out of the low pressure system.

yea we cycled the key bout 10 times a couple of times no matter what you cant get it goin without either, im wonderin if he needs to drive it some to clear out the pump and stuff from it sittin, we ran it for almost 8 hrs idling and didnt do squat

I would check to see if the batteries are any good. Could be have enough juice to crank it but not enough to run everything else.

well we just replaced them and still nothin it turns over faster a little but still wont with out some spray...told him to get a stroker... i just dont understand this dang thing, starts fine and runs full power after started with spray...:argh:

Pulled cam/crank sensors and inspected for damage or anything stuck to them?

where are they at? im a ford guy remember lol