I just purchased a 91 dodge diesel, it starts right up and runs great after you bleed the fuel system at the injector - turn it off then it wont start...
need to re bleed... any ideas? fires right up only after cracking the fuel lines at the injectors and bleeding all 6... if you dont it just cranks and cranks..

any ideas ? Thank you.

 

Sounds like you have an air leak, thanks captain obvious. It is probably on the suction side, which can be hard to find because they often don't leak fuel. One thing you can do is pressure your fuel tank with 5-10 psi and look for fuel dripping. I had the same problem and it turned out to be a crack in the lift pump...Mark

 

when mine was doing this, it was the o-ring on the bottom of the fuel filter drain. Cost me the o-ring and 2 hours for the mechanic to find it. I would do as maybe368 suggested and put some pressure to it.

 

How do you pressurize the fuel tank? Modify a cap?

 

You can do that or you can stuff a bunch of rags around the hose. I actually used duct tape to thicken the hose and it kind of threaded into the opening. It doesn't really matter if it leaks, you only need 5-10 psi for a few minutes...Mark

 

In fact it's a plastic tank. More than a few pounds of pressure will rupture it.

Most of us use a rag wrapped around a hose, but you can modify a cap for hands free operation. Just be sure you use a regulator to hold the pressure WAY down.

 

I had a leak from my wtr in fuel sensor and just replaced the whole filter with one that had no sensor. Leak fixed...

 

In fact, I put 25-30 psi into mine the first time and the tank did not rupture. Maybe it could have, but it didn't. 5-10 is fine...Mark

 

Ok, makes sense. My air compressor does have a regulator, that can go down to zero.

 

I took the regulator off a discarded blown cheap compressor and put an input male and output female air fitting on it.

I use it for:

Testing oil drums for leakage (4-5 psi)

Pressuring fuel tanks looking for leaks. (5 psi through the charcoal canister hose. (gassers)

Clearing water lines in the camper for the winter: (25 psi)

Controlling a die grinder for sharpening chores (50 psi)

Pushing product out of a steel drum (4-5 psi)

Controlling compressed air so I don't blow parts off a computer I'm evicting the dust bunnies from. (10 psi)

It's pretty handy. Would be worth buying a small regulator to make.