Engine/Transmission (1994 - 1998) Engine finally ran, but more questions and problems!

[edgeman]

Alright boys here is the scoop. I got the truck to run for about 30 seconds to bleed the injectors off. It ran off straight diesel too, which is a huge improvement. But now I am getting great fuel pressure at random times. I checked the Timing again on the pump and it is right:-laf. But when I crack the bleeder screw on the top of the filter I am not getting any bubbles and no fuel coming out of it. When I prime the lift pump I then get bubbles and can get the truck to fire. But then nothing. Could this be the lift pump or bad fuel lines. If it is bad fuel lines, could it be the rubber lines behind the engine? Please help, I just want to get the truck running!!!:{ Oo.

 

[snappy]

That truck was running before on the lift pump, correct? I would suspect that it has a lot of air in the fuel system. Have you bled it at the injectors?

 

[edgeman]

yes i bled the injectors for a few hours. The fuel flow was great at one point in time and then went down hill again. Do you still think that I need to bleed the injectors more?

 

[snappy]

The engine will tell you want it wants, but deciphering the clues is open to interpretation. The fuel should be at a couple of the injectors. Enough to get it to start and run rough. All you can do is verify that there is fuel at the injectors.

I read the first post and understand that it ran for 30 seconds, then died. That sounds like air, but is there fuel at the injectors now?

 

[edgeman]

There is fuel at the injectors snappy. But I don't get a good squirt all the time (what I mean by squirt is when the injector is cracked and I roll the truck over it squirts but not all the time). I think it is still air and I am going to try to keep bleeding the system. I have just never had a truck that was this hard to bleed out before!

 

[fest3er]

Bleeding is easy. Crack the injectors, start the engine, stop it when it's smooth, uncrack the injectors. Done. You've become very proficient at it.

It's a different problem entirely if you are having trouble *keeping* it bled.

• Put on shooting muffs or ear plugs,
• start the engine
• bleed the air out of the fuel,
• close the injectors,
• shut off the engine,
• remove ear protection
• put on a stethoscope
• listen for air burbling into the fuel system

If fuel is draining out as fast as you seem to indicate, you'll hear the air somewhere. You might even be able to hear it without the scope. But if the leak is that bad, you should see evidence of fuel on or near fuel lines; maybe not much, but evidence none-the-less.

 

[edgeman]

well I am going to go home and see if the fuel filter is still primed and if it is then I know that the system is not leaking air in. So we will see!

 

[edgeman]

Well here is what I found out with my truck. I pulled the lift pump and the rubber lines behind the engine off. The rubber lines are deffinitly dry rotted but I don't think that they are bad enough to the point that they are leaking air, but I am going to change them anyways seeing how they are off of the truck. I pulled the lift pump off and inspected it real well to notice that some one had been in it before. I pulled it apart and I noticed some blue silicone type stuff that was in the plastic cap. I don't know if that is what is supposed to be in it but it is. That was just torn apart. So needless to say my lift pump was definitly leaking air and pressurizing the tank. So it looks like I will be ordering a new lift pump from geno's and the lines from Larry B's. Thanks for all your help I will post pics of what I found so you guys can look.