What is the reason you guys are switching from the lift pump (stocker) to the piston pump?

What are the differences between them ...pressure...longevity....

How does a piston pump operate...the same as the stocker run off the cam....

Is there a certain piston pump you buy for it (and from who)?

Is there a pressure difference between them?

I am looking in to this and just have alot of questions about it as for the reasons and how ths piston pump works. TIA

 

More pressure/volume. Yup off the cam but uses a piston VS diaphram on the stocker.

From ''the stickies''

https://www.dieseltruckresource.com/...ad.php?t=93722

You can but the whole upgrade kit here:

http://www.dieselautopower.com/produ...ton%20pump.htm

 

Many reasons to upgrade, the most important being that a diaphragm-pump (the original issue) can rupture and pump fuel into the crank-case, whereas a piston-pump cannot.

The piston-pump holds a steady 15-ish PSI, as to the diaphragm's 3- to 7-PSI.

The primer-pump on a diaphragm-pump is somewhat particular as to where the cam-lobe must be oriented before it will work and then it takes a lot of pumping to move much fuel.

The primer on a piston-pump seems to care not what the orientation of the cam-lobe is and will pump quickly and strongly.


Etc. Etc.

 

Why do you need the spacer between engine and pump on the piston pump

 

Because the piston-pump is designed to work on several different makes of engines, not just Cummins.

The spacer is required to place the operating-rod at the correct position in relation to the cam-shaft.

Some applications use no spacer; the 6BT requires a 3/16" thick spacer; some require more; some less.

The bolt-pattern and overall flange shape of lift-pumps is pretty much standard on nearly all smaller engines, be they gas-burners or diesels.