Trouble bleeding fuel system.

[Dead Bunny]

91 d250 1ton auto. VE pump.

http://www.youtube.com/watch?v=Z8_e1l7Uf0o
video of air back-flowing through ALL 6 injectors.

Currently what the problem is is I can't get the air out of the system. I isolated the injector return line from the IP return line. I also isolated the IP by unhooking the injector lines and attatching clear hose to the injector lines. Where Im at now is when I purge the IP via a purge bulb installed before the lift pump or by cranking the engine, It purges just fine. As soon as I hook the injector lines back up and crank it over, I can see massive amounts of air coming out of the IP return line (obviously back-flowing from the injectors).

What my delema is is that according to the above video, all my injectors are messed up. I would replace them but I can't fathom ALL my injectors sticking open at the SAME exact time. I don't want to thow money them replaceing them and then find out my injectors are not the problem. Im also thinking this is normal behavior for injectors that are under compression with no back pressure. Which leads be to believe something in my IP is stoping it from creating the 3000lbs or needed pressure.

What Iv done so far:

-installed a purge bulb before the lift pump and a clear line between the lift pump and the purge bulb.

-Bleed the hell out of the system. No air getting in before lift pump. Bleed injector lines 3 at a time, 1 at a time, all at once, with injector lines on and off and got nowhere. Iv dumped approximately 5 gallons onto the ground and had to refuel.

-removed plunger for shut off solenoid.

-isolated return lines from IP an LP with clear line.

[randyswelding]

how bout with the steel lines on?how is the clear line hooked to the injecters?and this is just me thinkin but shouldnt there be fuel in the lines all the time?dude keep us up to date.

[Dead Bunny]

As soon as I hook the injector lines back up and crank it over, I can see massive amounts of air coming out of the IP return line (obviously back-flowing from the injectors).

[Begle1]

Sounds like a job for the ether bunny.

[Dead Bunny]

Sounds like a job for the ether bunny.

LOL

Just got myself a can. I'll be trying it as soon as there is not a monsoon outside.

[TWorline]

Just got myself a can. I'll be trying it as soon as there is not a monsoon outside.

If you try ether unhook the heater grid relays that are mounted on your fender well, your head gasket will like you.

[Begle1]

Yes, true.


It's, like, 80 degrees out here. You mean some parts of the country are cold enough to still have grid heater weather?

[TWorline]

Yeah they are talking SNOW around here the first part of next week!

[Richie O]

Ya. Dead bunny and me are fighting the same storm. Its raining pretty bad.

[RumbleFish]

It's, like, 80 degrees out here. You mean some parts of the country are cold enough to still have grid heater weather?

ya...this is my 1st factory IC truck, and the grids comes on all the time. it was 50-some degrees today, and the grid heater came on when i turned the key. my 91.0 nonIC truck wouldnt use the grids until 30 some degrees.

after having both, i think id rather have a non IC truck again. they run better for less (up to a point of course) and get better mileage in my experience.

[dpuckett]

My nonIC truck had grid heaters on at 55deg, too.

Dead Bunny- You'll never get the system bled that way. Hook your injector lines up like normal. Tighten them to normal torque. Loosen each one 1/6 turn. Crank til you see fuel shoot up on the bottom of the hood (if the #5 and #6 dont hit the hood, you have other issues). Tighten the lines that are flowing fuel. Crank again til fuel comes from more lines. When all 6 lines are shooting fuel, and are tightened, they are bled.

I know a guy who had fuel coming out of 3 or 4 lines, and barely at that. Turns out the wet fuel he had just put in his tank was the cause of his pump failure.

Dan

[Dead Bunny]

Just got myself a can. I'll be trying it as soon as there is not a monsoon outside.

If you try ether unhook the heater grid relays that are mounted on your fender well, your head gasket will like you.

whoa thank you. Good thing it was raining out today or I would have just ran right over from pepboys and started spraying away. I just had a mental image of the ether igniting as soon as it hit those heaters and I think nothing good can come from that.

someone on another forum told me to do this but I didn't know if I should take them seriously. Iv been really sketchy on actually doing it. Iv been diving little honda's for the last 8 years and my confidence is still kind of shaky when It comes to diesel.

[Dead Bunny]

ITS ALIVE!!!!
ITS ALIIIIIIIIIIVE!!!!

taking wannadiesel and begle1's advice I hit it with some ether.

process: cracked the injector lines and cranked it over until I saw fuel spitting out of all of them. Tightened them down and then took off the intake at the turbo and hit it with the ether. Took me about 10 times of spraying in ether and it just sputtering. But eventually it did start.

One thing I might have forgotten to do is to unplug the heater grid relays if TWorline hadn't have told me to. Thank you WD TWorline and Begle. Id be f#*ked without your help.

[dpuckett]

Good. Glad you got it running. What did it?

[Dead Bunny]

Good. Glad you got it running. What did it?

I must have edit my post just as you were responding. sorry. see previous post.