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

[Rogan]

after my pump rack stuck forward, along with a barrel/plunger, and 1500$ replacement pump, I run 1qt ATF in every other fill-up.

 

[Texis]

Rogan,



I was using a little ATF in each tank until I was warned about the effects by a techie buddy of mine. Apparently the ATF does not burn off, or at best burns dirty. The end result is that it will coat the turbo's wheel with junk/smut and screw the turbo up.



Not my rendering, but I would look into it if I where adding it on a regular basis. I do a little Lucas from time to time now.

 

[SRath]

The way I see it, a fuel pump needs a lubricant that:

1> mixes extremely well with fuel and stays mixed
2> burns cleanly and is designed to be burned in the combustion process
3> provides lasting lubrication even when used in very small amounts
4> is not harmful to any fuel system components (metals, plastics, rubber, etc. )

There may be some reason NOT to use it in diesel fuel, but I have never read or heard a single one (the EPA can kiss my backside), and nothing I can think of does all of the above better than Amsoil Dominator 2-stroke racing oil or Mobil1 2-stroke racing oil.

 

[Rogan]

Rogan,



I was using a little ATF in each tank until I was warned about the effects by a techie buddy of mine. Apparently the ATF does not burn off, or at best burns dirty. The end result is that it will coat the turbo's wheel with junk/smut and screw the turbo up.



Not my rendering, but I would look into it if I where adding it on a regular basis. I do a little Lucas from time to time now.

The way I see it, a fuel pump needs a lubricant that:



1> mixes extremely well with fuel and stays mixed

2> burns cleanly and is designed to be burned in the combustion process

3> provides lasting lubrication even when used in very small amounts

4> is not harmful to any fuel system components (metals, plastics, rubber, etc. )



There may be some reason NOT to use it in diesel fuel, but I have never read or heard a single one (the EPA can kiss my backside), and nothing I can think of does all of the above better than Amsoil Dominator 2-stroke racing oil or Mobil1 2-stroke racing oil.

Thanks, guys. I'll reconsider using it then.



Regards,

 

[GAmes]

Thanks, guys. I'll reconsider using it then.



Regards,

Glad to hear that! 30 or 40 years ago the ATF was a lot different and there never was any real proof it cleaned anything. Todays ATF is a mixture of additives best used in the alloy metal transmissions that were not even thought of when the old trucker tales were born.

 

[WDaniels]

97 with 250k. Synthitic engine oil used since new. Original fuel system except fuel heater and pump. Original injectors, p-pump and modified Piers cam. Run #1 uncoloured diesel in the winter with either howes or diesel power service in every tank. #2 uncoloured during the summer with same additives. Got 20 to 21 without topper and dropped to 18-20 with topper.

WD

 

[Missouri Mule]

Mule 96 (new pump at 20,000) Pump has 208,000 truck has 228,000 after going from 245's to 265's mileage dropped from 19 to 20 mph to 18-to 18. 5mph ( or maybe the Mule is just getting old). Once a year additive to clean/lubricate pump and injectors.

No mileage decrease since ULSD.

Freightliner (Moose) no mileage decrease since ULSD ( 11. 5 mph).



Just finished figuring fuel mileage for Mule in 2009 19. 1 ( after missing a few years I put the additive in)Moose stayed the same.

 

[DSpringstead]

kenny61

I have a '97 SC/LB with 135,000. I use Racor (from Geno's garage) & had absolutly no

pump issues. Last time I checked mileage was 21. 32 mpg. I do 80 miles round trip everyday using cruise.

 

[DSpringstead]

Need some help in explaining what AFC springs are? I ordered 3K GSK springs from TST & noticed "AFC" springs. What are they & what are their purpose?

 

[LVJUNIOR]

AFC springs control the rate that the boost affects fueling. A light spring will allow you to reach full fueling at say 10psi where a heavy spring may not reach full fuelling until 30psi (numbers are hypathetical) If your turbo maxes at 25-30 psi a light spring will work but if you max at say 50psi you are going to be slamming it with full fuel before you have the air to burn it.



If I am misguided on this someone please correct me

 

[kenny61]

I'll ad that they will / may help with smoke issues depending on the users setup and I believe that is why TST sells them

 

[jleons]

Hello

96 5. 9 w/ 590,880 miles. Use Alamagated fuel additive. No problems or replacement on any components.

Thanks

JL

 

[Rogan]

just returned from a roadtrip, no towing, 95% highway. 265/75s, 3. 54s, 5 speed. 68mph, 24. 9mpg over 629 mile round trip, with about 1/8th tank left on the single fill-up.

 

[KBurgoyne]

95' 177k run with diesel kleen slick diesel formula. the p pumps have rubber bearings that can dry out. i know that california fuel is low sulfur that doesnt leave much lubrication for the pump, but i dont know about new york. the additive only takes 1oz for every 10 gallons so its cheap insurance. i get around 21mpg

 

[Joe G.]

I have over 262K miles on my '95. No fuel additives used. Original injection pump. It runs great. I seldom see anyone fueling up that use any additive. If the additives were doing any good we should hear about more P7100 failures for people who don't use them than we do. I think all the additives are snake oil and worthless. Sulfur is NOT a lubricant. I get about 20 MPG in normal freeway driving.

 

[charlessmith]

On '96 3500 2WD auto - steady 65 MPH empty gets 23+, ULSD, no additives. Also has FlexaLite fans, 16*, DDP2.

On '97 2500 4WD DRW auto - steady 65 empty gets 19+, ULSD, no additives, 16. 5*

Both have over 200,000 miles, 3. 54 gears. No pump problems with either truck. Mileages are very steady 65 MPH on flat freeway, no wind, at least 300 miles for measurement, fill tanks clear to filler lip.

 

[BHaden]

On '96 3500 2WD auto - steady 65 MPH empty gets 23+, ULSD, no additives. Also has FlexaLite fans, 16*, DDP2.



I saw your "Flexalite Fans" and wondered if they had any advantage over stock mileage wise and DO THEY COOL PROPERLY when towing? Magazine articles about fans always talk about extra power and never if they cool when pushed hard.

TIA



Bruce