Engine/Transmission (1994 - 1998) P-Pumps, Fuel and Mileage

[kenny61]

Just a quick Survey



Please post the mileage on your 5. 9, the type of fuel you run, if you use an additives and if you have had any p pump problems as of yet. The intent of this thread is only a survey to see if ULSD is bad for the p-pump. please no opinions or "I heard of a guy who knows a guy who's truck... "



Thank you







223K, original p-pump, ULSD since its mandate, no additives and no problems.

 

[Rick Comenzo]

Kenny ,I'm new here,, you will rarely see me posting on the first generation forum (have a 93 350), and a new to me 94 2500 2WD with 309,000 miles. To my knowledge no major pump/injector work has been done, I use power service additives(anti gel), and usually get near 20 MPG on the road. Rick

 

[roosp]

Kenney, I have 301,000 on mine. Use Stanadyne Perfomance Formula. No P-Pump issues ever. I put performance injectors in long ago no issues.

 

[GaryOwen]

302k miles



Use #2 diesel (Flying J ULSD of late)



Have used additives about half the time (probably 75% of the time since ULSD). Have used Stanadyne PF, PS (silver and white), 2-cycle oil, and Fuelmasters Flo-max at one time or another.



Original p pump, injectors, and lift pump (suspect lift pump is getting tired though and have a replacement ready to go in).

 

[CToney]

The P-pump receives engine oil for lubrication. This is why you are supposed to use the microglass fleetguard filter instead of the cellulose one. Added lubrication is beneficial in all cases in my opinion. The few cents per gallon that it may cost is well worth it. P-pumps are expensive to fix. Added fuel filtration doesn't hurt either especially if you have high humidity and can get water in the fuel. Those additives usually help combat that as well. My '97 I had would get 20mpg easily.

 

[Joe G.]

I don't use any additives and have been running ULSD since it came out here in CA. I think that was a while before the rest of the country started running the stuff. No problems at all. Mileage dropped from 21 - 23 to 19 - 21 on the highway, but I don't know if that is because of the change in fuel or something else. I have seen no evidence that additives are useful. Just word of mouth unsupported with numbers. Fuel suppy system is stock.

 

[SFPADGETT]

93 250 ,auto, 2wd, with service body, pump changed about 3 months after ULSD, 386k--22,mpg down to 18. 5, back up to 21 with Lucas additive

94 3500 flat bed, auto, 2wd 165k, mileage drop from 18. 23 to 14. 1 back to 16. 7 with Lucas

95 2500 service body, 2wd, 264k, mileage drop from 18. 1 to 14. 9 back to 17. 23 with Lucas

95--2500, 4x4, auto 350hp mods by Jeff Garmon, 416k, mileage drop from 19. 7 to 11. 6, back up to 19. 8 with Lucas (and timing increase)

95 3500 service body, 2wd, 287k, mileage drop from 16. 1 to 15. 7, up to 17. 2 with Lucas and readjusting the timing to stock (it was low)

98 2500 service body, 2wd, 386k, mileage drop from 14. 5 to 12. 1, up to 15. 1 with Lucas

98 2500 service body, 2wd, 316k, mileage drop from 14. 4 to 12. 6, up to 15. 3 with Lucas

(both of the 98's are usually in Atlanta, GA city traffic every morning / afternoon, and limited amount of time at highway speeds)



The 95 4x4 had used Lucas for about 6 years, the others only when the ULSD came into being here in GA



Only the 93 has had any issues with pump, the others have had fuel leaks and lines replaced, since ULSD, but could have been due to age. The 93 started leaking fuel (almost every where) at the first tank of ULSD and got worse



Have used Power Service (Gray bottle) in limited amount when "questional" fuel had to be used

 

[GrantP]

Just a quick Survey

223K, original p-pump, ULSD since its mandate, no additives and no problems.

Same here, 151k.

 

[kenny61]

93 250 ,auto, 2wd, with service body, pump changed about 3 months after ULSD, 386k--22,mpg down to 18. 5, back up to 21 with Lucas additive

94 3500 flat bed, auto, 2wd 165k, mileage drop from 18. 23 to 14. 1 back to 16. 7 with Lucas

95 2500 service body, 2wd, 264k, mileage drop from 18. 1 to 14. 9 back to 17. 23 with Lucas

95--2500, 4x4, auto 350hp mods by Jeff Garmon, 416k, mileage drop from 19. 7 to 11. 6, back up to 19. 8 with Lucas (and timing increase)

95 3500 service body, 2wd, 287k, mileage drop from 16. 1 to 15. 7, up to 17. 2 with Lucas and readjusting the timing to stock (it was low)

98 2500 service body, 2wd, 386k, mileage drop from 14. 5 to 12. 1, up to 15. 1 with Lucas

98 2500 service body, 2wd, 316k, mileage drop from 14. 4 to 12. 6, up to 15. 3 with Lucas

(both of the 98's are usually in Atlanta, GA city traffic every morning / afternoon, and limited amount of time at highway speeds)



The 95 4x4 had used Lucas for about 6 years, the others only when the ULSD came into being here in GA



Only the 93 has had any issues with pump, the others have had fuel leaks and lines replaced, since ULSD, but could have been due to age. The 93 started leaking fuel (almost every where) at the first tank of ULSD and got worse



Have used Power Service (Gray bottle) in limited amount when "questional" fuel had to be used

Just to clarify the 93 had the VE pump and that is the only one that actually had a mechanical problem / failure? and did the failure occur while using the Lucas additive?

 

[GAmes]

730k miles and only use additives when buying fuel in the south while on my way to the great white north in the winter. I never add anything to fuel bought in the north. Replaced the original injectors at something over 500k and have never had the p-pump worked on other than timing. Freeway driving 65 to 70 mph, not towing I get between 19 and 21 depending on wind and terrain.

 

[kenny61]

So far so good but for some of us non additive users please specify what type of additive it is (lubricating or anti gel or whatever). Basically this thread is a survey to see if ULSD is effecting the p-pumps.

 

[SFPADGETT]

Kenny61

The 93 had the failure (VE Pump) without using the Lucas. After the rebuild the mech suggested using the Lucas in all of our trucks and he thought that the combination of age and the ULSD fuel caused the failure. His shop was covered up with "VE" and other "older stlyle" pumps when the ULSD came out. He was happy for the work, but regretted that the fuel change had caused so many people so much trouble. He had 47 pumps (VE) in front of mine, when he normally only saw 10-12 per month before the ULSD came out. When I picked ours up, he had 86 (VE) in for repairs!

I had been using Lucas in my 95 for several years before. We have been very pleased with the results (lack of fuel related issues) and mileage improvements of the small fleet.

 

[kenny61]

Ok thanks for clearing that up as the VE pump is a different design and is fuel lubricated like the vp 44 both unlike the p-pump which is oil lubricated

 

[kenny61]

Thats it Nobody else in this forum has a P Pump????

 

[hsmith]

OK, my "low" mileage 210k '96 has never gotten over 20 but always 12 plus towing. I use additive sometimes, don't see any increase in mileage when I do.

 

[Gasmasher]

220k on truck no lift pump or p-pump problems all factory original. using ULSD no additives get 18 -21 empty. 10-15 depending on how heavy load is.

 

[SFPADGETT]

Kenny,

maybe some of the readers dont know that what you are asking about

"P-Pump" is actually the Bosch P7100 fuel injection pump

 

[mfburns]

NO additives, had a rebuilt injector pump right after I bought the truck (used). This was long before the ULSD came into use. I have not noticed any great reduction in Mileage with the ULSD. I got 19. 6 over the first 200,000 miles, hand calculated, thanks to the great fuel gauge. I notice changes in winter and summer, maybe . 5 MPG to 1 MPG.

 

[CBlack]

ULSD... 114,000 miles... . 17. 5-19. 6mpg... no issues with the fuel system. I have used, at various times, 2 cycle oil, Stanadyne and acetone.

 

[kenny61]

Kenny,

maybe some of the readers dont know that what you are asking about

"P-Pump" is actually the Bosch P7100 fuel injection pump

Correct, Thank You