Mysterious air lock
- Thread starter crash86
- Start date
Redneckaggie already mentioned something similar. But when it dies have you looked at all the rubber lines especially at bends to make sure there're not getting sucked closed? Granted it was a gasser, a old chev I had kept sucking the rubber fuel line closed that ran between the frame rail and mech FP. After 10 minutes give or take a couple the vacuum would bleed off and I could drive a few miles then it'd collapse again. Just a thought.
Oh nm you said you bypassed the mech pump
Oh nm you said you bypassed the mech pump
Beads 93 idi
Brads 93 idi
my buddy is in the same boat we are having issues with it losing its prime one tank is 3/4 full and the other one is being sucked from a 5 gal jug
Can30Diesel
Full Access Member
I might have missed it somewhere along the way, but I think you had mentioned that it blows white smoke until it heats up. It also dies after it heats up. What kind of smoke are you getting if any when it dies? Does it feel gutless first or does it just stutter stumble and quit?
I don't remember seeing this information yet, how old are the injectors?
I don't remember seeing this information yet, how old are the injectors?
Yes, it blows white smoke on start up and will puff it out at idle and if I tap the pedal it will be black then white following right behind it. When it dies as I'm driving it will start smoking white real bad, it isnt responsive at all (i can put the pedal to the floor and no response) and then finally just die. the injectors are maybe 5k miles old. So I dont think thats the problem. Any suggestions welcome.
redneckaggie
rebel w/o a cause
I would mount a fuel pressure gauge plumbed into the cab, see what your fuel pressure is doing while it is dying, I have had lines suck closed and cause this problem, I have also had an electric pump gum up internally and do this, To prevent that I removed the electric pump, cleaned it, and reinstalled with a little in line prefilter, the pump would not pull hard enough to keep the truck running with a brand new prefilter before it, i removed the prefilter and now I just remove the bottom from the pump and clean the internals about every 6 months to a year.
Are you running the propane while it is doing this.
What electric pump are you running?
have you done a volume and pressure test at the fuel filter head to confirm the pump is performing to par.
Are you running straight diesel.
does the truck surge when it dies, are you leaving it in gear and letting it coast while it dies?
Are you running the propane while it is doing this.
What electric pump are you running?
have you done a volume and pressure test at the fuel filter head to confirm the pump is performing to par.
Are you running straight diesel.
does the truck surge when it dies, are you leaving it in gear and letting it coast while it dies?
redneckaggie
rebel w/o a cause
I would also remove one pump or the other they could be counteracting each other. I have gone as far as running my own line from an e pump all the way up to the filter head to eliminate any possible hairline cracks in lines.
Can30Diesel
Full Access Member
Yeah my truck only had the 1 tank from the PO so I fabbed up and ran my own line to and from the tank and the engine. Running dual tanks later on might be interesting, but at least I know what I am working with.
I've had your symptoms before. the first time was debris from the injector pump that clogged up the check valve in the return line off the top of the injector pump, so fuel had no where to go. The second time was fuel starvation from insufficient fuel getting to the injector pump. In both cases, the injector pump was getting pretty hot as well.
It sounds like a fuel flow thing from the smoke color.
I seem to remember reading somewhere that the "T" at the end of the return line system near the back of the engine can be a trouble point for return line systems. It can leak and suck in air and it can clog. Maybe check that for problems.
Also, If you haven't already done so, run a jerry can of diesel with new source and return lines going to it. That should eliminate everything from the engine bay back.
I've had your symptoms before. the first time was debris from the injector pump that clogged up the check valve in the return line off the top of the injector pump, so fuel had no where to go. The second time was fuel starvation from insufficient fuel getting to the injector pump. In both cases, the injector pump was getting pretty hot as well.
It sounds like a fuel flow thing from the smoke color.
I seem to remember reading somewhere that the "T" at the end of the return line system near the back of the engine can be a trouble point for return line systems. It can leak and suck in air and it can clog. Maybe check that for problems.
Also, If you haven't already done so, run a jerry can of diesel with new source and return lines going to it. That should eliminate everything from the engine bay back.
redneckaggie
rebel w/o a cause
airtex rated at what psi and gph
what did the volume test yeild
what did the pressure test yeild
Have you tried removing the prefilter
Have you tried removing the mechanical pump
please answer all of these and provide a little detail
what did the volume test yeild
what did the pressure test yeild
Have you tried removing the prefilter
Have you tried removing the mechanical pump
please answer all of these and provide a little detail
redneckaggie
rebel w/o a cause
sounds like air intrusion or a sticky metering valve.
Trying my best
Full Access Member
Sorry if someone else said this. I'm kinda grasping for straws here but if you were to take jug of fuel and hold it above your injection pump so that gravity was your fuel pump, would that help rule out lift pump? I guess that would be tough to do when you're driving though ha ha.
Similar threads
