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I have gotten the rig to start and run (2001 7.3 with 6 speed ZF)
I have driven it around the yard a few times now.
"BUT", the white exhaust smoke concerns me. It is never black or sooty, just white, like it looks right before it runs out of fuel.
I have been having fuel pump/tank/line issues and have run it out of fuel more than once. I have not been able to drive it at speed yet, or any type of load.
Buzz test was good. 186K miles on the clock, but it was a service truck, so it could have a million hours on it.....
If you're having fueling issues then setting up a fuel pressure gauge would be the logical first next step. There are at least 2 write-ups for pressure testing in the tech section up w/ the sticky's. You can also try running a hose from the pump inlet to a fuel can to rule out any in tank issues. Do you have a way to monitor live data and scan for any codes? Have you chased out all the fuel lines from where they exit the tank to entering the heads any kind of leaks?
Ok thanks. I am currently running the engine with fuel in a 5 gallon can on the ground, with the fuel return dumping back into the same can. It IS clean.
I took apart the return line at the fuel bowl and blew that with compressed air (not hooked to the can) I also blew out the supply and return lines. all is/was surprisingly clean.
The fuel pump on the frame rail is a major PITA to get primed and going.
I have forscan on my laptop and can gather data, but am completely new to it. What info will be of interest to record/look at?
Any clue if the fuel pump is the original Bosch or an aftermarket replacement? If the pump is healthy, there isn't any obstruction between it and the supply, and absolutely 0 leaks on the suction side then it should prime fairly easy.
Edit: Try running the from the bucket straight into a separate bucket. You should see a strong clean flow of fuel, if you see bubbles you have a suction leak. It flow is weak so is the pump. It should be able to move around 35 gallons per hour, which would empty that bucket in roughly 5 min.
Trying to answer all of your comments:
The New (current) pump is a NAPA replacement, a 'Walbro' IIRC
The old one I will have to check. Both I think are quality OEM units.
The plastic line INTO the pump seems ok, it has the stock pressure discharge line on it still
The white smoke smells like Aerated diesel fuel, like it is unburnt almost...
After say 5-10 minutes it seems to become normal. I am not able to really load the engine yet by driving and putting some heat into the engine.
***I just saw a procedure for testing the fuel pressure. I had no thought of checking the drain of the fuel bowl!!
If it clears up, I'm going to say that it might just be normal. But...are your glow plugs working? And what if you plug the block heater in for four hours before startup? These things are not the diesels of today.
Glow plugs are working. I can hear the contactor pull in, measure voltage on the load side of the contactor, see the dash gauge voltage drop, and hear the fuel pump's rpm drop when they are enabled and the wait to start light is on.
It starts fine, Was just curious about the smoke. might be nothing.
I got a gauge hooked up, good primary fuel pressure. I slowly worked my way back to the main tank checking each hose/line/clamp connection, and added fuel to each link as I went. I finally poured new clean Diesel into the main line, and, as it was full, snapped the fancy connector to the tank and turned on the pump. It help the 'prime' and has been working well ever since!
Hey guy…nice truck…right along my thought process but I didn’t get around to it….yet……..anyway, the best way to score our injectors is low fuel pressure….that gauge is very deceptive…you start driving, another words putting any kind of a load you will see that pressure just keep on dropping….2 things I did to maintain good pressure is …the hutch mod or with your truck maybe some sort of pickup mod to assure good non aerated volume….then an upgraded spring on the fuel return line out of the stock filter housing….I maintain 70psi cruising and never drop below 50 even when ***** to the wall… there are numerous videos where an 8 foot hose is used with the fuel pressure gauge taped to the side view mirror. Perfect 60 psi sitting there idling, dropping in gear start driving and the gauge just goes down and down and down.
I have a small in-line filter in between the tank pickup and the pump…I have no problem pulling fuel after a filter change…is that a stock 450 tank…did you ever pull the sender and check those clogged socks??…. No filter…in-line needed to protect pump
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