No smoke from the tailpipe means no fuel. No wonder it will not fire off.
fuel return priming system...
- Thread starter Nick_Rego
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- 7.3 idi e-fuel electric pump fuel
No smoke from the tailpipe means no fuel. No wonder it will not fire off.
Booyah45828
Full Access Member
This here. I'd try bleeding the lines again.
Your bubbles from the glow plugs means they aren't seated and are leaking. I wouldn't worry about that though until you know you're injecting fuel.
Are you certain the cap on cylinder 8 is seated all the way down? If so, then you have to remove it and see why it's leaking. Could be the harbor freight o-rings, or it could be a bad/deformed cap.
nelstomlinson
Full Access Member
Doesn't bubbles from the glow plugs indicate that they aren't sealing, and so you're losing compression? Might be getting fuel, but not getting enough compression to ignite it.
No smoke from the tailpipe means no fuel spraying in the cylinders regardless of anything else happening.
nelstomlinson
Full Access Member
Franklin, if the compression gets low enough, could the fuel vapor just wind up condensing in the muffler?
Not just "condensing"...
If the compression is low enough, the fuel will simply be shuffled right on through as fuel. There would be no smoke.
OP... Pull the dipstick and smell for fuel. You won't necessarily smell it. But if you do, it's a pretty good indication the fuel is simply washing past the rings as well.
If the compression is low enough, the fuel will simply be shuffled right on through as fuel. There would be no smoke.
OP... Pull the dipstick and smell for fuel. You won't necessarily smell it. But if you do, it's a pretty good indication the fuel is simply washing past the rings as well.
Nick_Rego
Registered User
i thought of that and checked it several times but looks good just changed the oil not too long ago still looks normal.. the glow plugs had bubbles around them on a few occasions when ive had leaks and all of those times it ran fine. i only mentioned that to show i have compression. i havent gotten to jump start it today and try it but i did notice last night that that main engine harness wasent pushed in all the way which means the pump wasent getting power. my question though wouldnt i not have fuel leaking out of the caps or mabye becasue it wasent building enough pressure to pop the injectors the lower pressure fuel has no where to go but out the return and uped the pressure a bit? idl just spit balling here. I got a pack of the mc master car o-rings and some white lithum grease im going to carefully install them and re install caps after checking them... fingers crossed wish me luck
I was told at one point that powering the cold advance would help bleed the pump housing. If you’re cold advance high idle switch isn’t working that could help. I don’t know if that’s really what the problem is.... likely not but if you’ve got no smoke, you are not close to running.
nelstomlinson
Full Access Member
Pump not getting power? That would mean no fuel. Turn your key to on, and unplug the fuel shutoff solenoid. You should hear a click when you unplug it, and a click when you plug it in again. It's the connector on top of the IP, driver's side, closest to the radiator. No click means no fuel. Get power to that, and you should at least start to see smoke.
Nick_Rego
Registered User
it definitely clicks /has power ive also been letting my dads 99 psd charge it while i crank and then every crank when its low i go pop the lines let some bubbles out has some bubbles still and no black smoke
Nick_Rego
Registered User
it definitely clicks /has power ive also been letting my dads 99 psd charge it while i crank and then every crank when its low i go pop the lines let some bubbles out has some bubbles still and no black smoke. also there is fuel activly dripping from the passanger side down the back of the head theres a square plate kidna thing back there that it looks like its coming from but its probably somewhere higher.the new o-rings and new caps and lines look good but its hard to tell when everything is soaked in diesel
Nick_Rego
Registered User
just checked it with the multimeter has 11.8v at the top post om the ip snd 12.4v on the bottom connector.. still no smoke did my injection pump take a **** too?
Nick_Rego
Registered User
is it possible that i havent bleed the lines properly ? i just watched a video and the guy had the throttle wide open while he was doing it.
Well, it’s possible the head seized and broke the shaft. I don’t know if there’s a way to check that without pulling the pump.
If you are getting good solid fuel out of the schrader valve while cranking, but getting no smoke at all out the tail pipe there is a problem somewhere. How much crank time do you have at this point. If the system isn’t bone dry, you should see something from the tail pipe long before it starts and will want to stay running.
If you are getting good solid fuel out of the schrader valve while cranking, but getting no smoke at all out the tail pipe there is a problem somewhere. How much crank time do you have at this point. If the system isn’t bone dry, you should see something from the tail pipe long before it starts and will want to stay running.
You do not need to bleed the lines. They will self bleed through the return system. Bleeding may speed up the process, but I have never found it necessary. The last time I ran my truck out of fuel I only had to crank it 4 or 5 20 second crank episodes before it started.
And the smoke will not be black. It will be white. It will be raw unburnt fuel coming out of the tailpipe and it will smell like it. It will be white puffs.
And the smoke will not be black. It will be white. It will be raw unburnt fuel coming out of the tailpipe and it will smell like it. It will be white puffs.
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