Engine/Transmission (1998.5 - 2002) Engine died would'nt restart

[paniolo]

Did a hard run came to a fast stop, motor sputtered and cut off. Would'nt restart. Cranked fine 15psi. fuel pressure. After bleeding the fuel lines at the injectors motor fired back up runs fine. Second time this happened. Edge comp, 90 hp injectors, air and exhaust, hybrid turbo. Any ideas of cause.

 

[KBaucom]

It could have Vapor locked if you ran it hard then stopped quick many trucks are known to do this. Just give it a little shot of starting fluid while you are trying to crank it and it should fire right up.

 

[paniolo]

I thought starting fluid on diesels could be hazardous?

 

[FourBarR]

if the grid heaters happen to be on when you spray in the starting fluid. boom. would you spray into a toaster when its hot? manual says no starting fluid.

 

[DrewStory]

.

its the same stuff, happens to me all the time, typically its when you have high boost and get out of the throttle, make sure the boost comes down before you jump right off the go pedal, if ya do that it shouldnt happen

 

[KBaucom]

Yes it can be dangerous but if the truck is warm then the heating grid won't be on spray the fluid to it i have done it many times and knock on wood i haven't have a problem yet

 

[csutton7]

you can vapor lock the truck when you have a box on after a hard run--just crack #3 & #4 injector nuts and crank her over until you get fuel--tight the nuts back up and then it should start shortly thereafter---sometimes it takes a little longer depending on how abrupt you stopped--chris

 

[paniolo]

Thanks for the replys. But what can I do to remedy this. Airdog/Fass? M i flooding or running dry?

 

[csutton7]

the only cures are to leave box off, get smaller injectors(maybe) or don't let off the pedal abruptly--air dog, fass or any other lift pump will do you nothing in regard to this prob--chris

 

[KBaucom]

Thanks for the replys. But what can I do to remedy this. Airdog/Fass? M i flooding or running dry?

A diffrent lift pump like a FASS will help because what is actually happining is that you are sucking the VP44 dry so if you put more fuel pressure behind it it shouldn't happen as often or even at all

 

[csutton7]

a FASS won't cure the prob--it's your foot--



if the FASS or similar pump is the problem wouldn't the vapor lock happen before one lifts off the pedal--the truck runs fine when you have your foot in the pedal, so if the lift pump can't keep up wouldn't vapor lock happen sometime during the time your pedal is to the metal--that's when it's calling for all the fuel it can handle and you should run it dry with the above theory---I think there's a vacuum created within the cylinder for a brief second when one lifts off the pedal abruptly--it sucks all the fuel out of the high pressure lines and the VP44 is in idle mode and cuts back fuel so much that a vapor lock is created---the lift pump has handled its duty during the run and after cuz it pumps the same amount of fuel all the time--it's output is never changed---also guys with FASS or other pumps have all encountered the vapor lock syndrome, including the 12v pump on a 24v---chris

 

[CumminsAholic]

Chris is right a FASS will not help. My truck did this today. It did it before the fass, I thought I had run it out of fuel... not so, still did it with the fass. It started easier the first time... held the go petal to the floor. This time I had to crack a few injector lines. Thought I killed the vp... and could get a hot rod pump... not yet I guess. I wonder if you'd let it set for a while if it'd start.



Corey

 

[paniolo]

Thanks again for the replys. I'm still lost. If im running 15psi at idle and 10 psi at WOT. I got fuel. So air somehow is in the picture. The high flow injectors? (fuel + air sucked in) Mine are small hate to be with the big boys.

 

[CumminsAholic]

Read Chris' last post again... The cylinder is sucking the fuel out of the injector lines? So it doesn't matter what transfer pump you have, the vp isn't pumping the fuel because you're off the throttle, but the motor is taking in the fuel, hense emptying the injector lines and causing the vapor lock.

Corey