Updated lift pump for 93

[rhabla99]

I want to replace the lift pump in my 93 ,I understand it may be advantageous to put an upgrade just mot sure what my options are? Thanks

 

[cerberusiam]

Stock lift pump.



Stock piston pump from an industrial motor.



Carter frame mounted electric pump.



FASS or AirDog electric with\without filters and entrained air removal.





Just depends on what you want for power and how much you want to spend.

 

[ENafziger]

First, why do want to replace it? That might help direct the best answer.

Along with what was mentioned above, you can use a stock lift pump from early second gen.

Or, for more flow, stock lift pump from late second gen with a pressure regulator.

I went with a Raptor pump for mine.

Some people use a Holley Black pump as well.

All the above options range from ~ $150 - $600.

If you want to stay with a mechanical pump, choose one of the second gen pumps. Which one you choose depends on what power you're shooting for.

If you want electric, there's alot of options, some being mentioned above.

Whatever you go with, remember pressure NEEDS to be regulated to less than 15 psi or you risk blowing the front seal on the high pressure pump... 12 psi may be a safer number.

 

[Ncostello]

I thought Cummins had a piston pump with the proper pressures for first gen VE equipped engines? If I recall... you had to do a little cutting/grinding/trimming to get it to fit but nothing major.

 

[cerberusiam]

They do. All that needs trimmed is some of the lifter gallery sound insulation.

 

[ENafziger]

I thought Cummins had a piston pump with the proper pressures for first gen VE equipped engines?

Yes, that's true. And it works well for stock or slightly higher hp levels. The p-pump second gen piston pumps provide better performance for higher hp goals, but also require a regulator to drop pressure to the injection pump.

What you pick depends on your reasons for wanting to replace it in the first place... which we don't know?

 

[Greenleaf]

... . sometimes, it is simply the matter of pulling a nasty looking, black/oily thing in favor of fresh cast aluminum patina and the gold-tone of cadnium plated mild steel... ... ...







... ..... ah... ... ..... it really turns me on.

 

[ENafziger]

low pressure high volume piston fuel pump - Dodge Cummins Diesel Forum

 

[rhabla99]

Thanks all, This is just a stock application. Reason for replacing is one age and two my power has decreased and other than the fuel filter i thought this may be the cheapest place to start

 

[Don in Missouri]

I am interested in this conversions, because I have had terrible expereince with replacement diaphram pumps. Their lifespan is simply too short. The lift pump is the weak link in an otherwise unstoppable truck.



Can I get a clarification on what ENafziger posted about early vs. late second gen pumps? If you use an early second gen pump, can you get away without a pressure regulator? What is the year model cut-off between these low and high pressure pumps?



I have a couple take-off pumps, and I'm wondering if one would be appropriate for my first gen?



One is an AC brand off a second gen Dodge, but I'm not sure exactly what year. The other is a Carter off a 175 hp 6bt out of a 1996 Ford school bus. The Carter appears to have larger barrels (judging from the outside appearance) and has a noticeably stronger spring on the plunger. Does the wekaer sping on the AC indicate it may be Ok for my first gen?



If a pressure regulator is a must, what kind is recommended? Do you install it between the lift pump and the filter?



A big reason I want to get away from the stock pump is because I have lost faith in parts manuafactures to provide a diaphram that stands up changing diesel fuel. If I depend on a pressure regulator to protect the injection pump, will I then be relying on the diaphram in the regualtor to prevent a much more costly and time consuming repair?



Am I correct to assume that a piston pump is more dependable, or are the check valves in a piston pump just as susceptible as the diaphram in a diaphram pump?

 

[Bob Beauchaine]

I am running a low psi Cummins piston lift pump that has supplied enough fuel for me to reach the numbers posted in my sig. and their outlet psi is 15 - slightly below the max psi for a VE IP. These pumps are supposed to be rebuildable aand are manufactured by Carter. I will try to dig up p/n's if you would like.



Bob

 

[Don in Missouri]

Yes, please share that part number. I found Cummins part number 3936320 from a search of other forum posts. My Cummins dealers says that number has been superceded by 4988751, and costs $252.



A Carter pump for a '94 Dodge from Napa is $100 less, but puts out 20-30 psi. The counter guy and the supplier he called could not find a low-pressure version. If you have the Carter number for the low-pressure version or a rebuild kit,that would be great. I have several pump bodies that I could rebuild, and three first gen trucks I'd like to upgrade if the first is successful.

 

[Bob Beauchaine]

Here are the part numbers:



seals(2)#3918191

Fuel Line (1) #3914753

Pump (1) #3936320

Gaskets (2) #3931348

Spacer (1) #3914284



Diesel Truck Resource has a excellant article in their 1st Gen FAQ section along with pics and a step by step how to for this conversion.