Quote:
Originally Posted by Oregonpharmer
Drop some Power Service 911 in the tank and see if you have a bit of ice or paraffin in the pump housings that needs to be dissolved.
If the transfer pumps are working flawlessly and there is no ice or paraffin built up, then I would suspect the VP44 front housing fuel circuit diaphragm has failed and is letting fuel bypass the injection pump pressure circuit. Unfortunately, if that occurs it is time for a rebuild.
That front VP diaphragm fails if the truck is run without pressure to the injection pump, and sometimes it only takes an instant on one with some time on the pump. If you do need a rebuilt VP, look for one with the new linered rear housing that keeps the case from eroding around the timing valve.
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Thanks OP. I just changed out the VP44 last year with a Blue Chip New pump. The ice or pariffin may be an issue here. A couple of tanks prior to this starting I was using PS every tank full. I had changed over to just 2 stroke oil and two tanks later this started up. May just be coincidence, I don't know. Just find it hard to beleive that two pumps that had worked flawlessy for a year now both start giving me problems at the same time.
I am also convinced that it is an issue with the LP's because you can hear the difference in how they sound when the pressure fluctuates. I also have a pressure guages mounted just after each pump and I could watch it jump as the motors sounded like they were freeing up. It sounded just like they had a blockage of some sort working it's way through.
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99 Quad Cab, 4wd, Comp Box W/Pump Wire & Boost Elbow installed, K&N Air Canon, MBRP exhaust, Twin PE 4200 High Pressure Fuel Pumps W/Fleetguard inline filter, Isspro EV Pyrometer, Boost Guage, Fuel Pressure Guage, DT Pro Fab Trac Bar, South Bend 13-1.25 Con O Clutch, Royal Purple Synthetics all around
374.2/846.7 at 30psi