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You can go to any auto or truck parts store and buy the o-rings as long as they are compatible with diesel.

There are 2 O-rings that measure 3/8 x 1/2 x 1/16 wide towards the end of the primer plunger after you remove it. I had just replaced mine that were sucking air along with the supply hose from the fuel filter to the IP that was also leaking. The truck would surge up and down while it was at an...