fuel pump questions ? February 12, 2018 02:57AM
can someone explain the differences between the p-pumps,3000-7100-8600, ?.looking at buying my first p-pump for a cummins.which is more performance friendly ?.is there any visual differences between the 3 models ?
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Re: fuel pump questions ? February 12, 2018 11:26AM
the p-3000 and p-7100 are similar pumps but i think the main difference is the 7100 has roller cam followers on each plunger
which will allow for a little more aggresive cam profile but both pumps can be built with large plungers and push 1200+ ccs of fuel.
Also the 7100 has a larger bolt hub pattern and larger cam bearings

the main difference in appearance is on the bottom of the pump body the 3000 has freeze plugs and 7100 has a plate on the bottom

the P 8600 is a different animal i dont know much about it. i think it originally came on some mack truck engines
but this pump is not allowed in alot of classes
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Re: fuel pump questions ? February 13, 2018 05:01AM
Quote
OL1955
the main difference in appearance is on the bottom of the pump body the 3000 has freeze plugs and 7100 has a plate on the bottom

P7100 has freeze plug and 3000 has plate on bottom
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Re: fuel pump questions ? February 13, 2018 11:25AM
you are correct i got them backwards my bad
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Re: fuel pump questions ? February 13, 2018 01:43PM
I've seen P3000's with freeze plugs in the bottom.

Typically 7100's all have the same pilot diameters and driveshaft diameters.

3000's commonly have different pilot diameters, as well as both large and small driveshaft diameters.
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