Cm870 lift pump or gear pump?

[Rawze]

the gear pump is mechanical and is driven by the injector cam.


The ELECTRIC LIFT PUMP however is electrical and is used to prime the engine during the first 2 minutes of the key-on cycle. It will not operate unless the key has been off for more than 30 seconds + during only the first 2 minutes after the key is turned back on.


--- As the electric lift pump goes bad, it very often takes the gear pump with it. there is usually some delay of a few weeks to months before this happens, as the metal fragments form the lift pump eat away at the gear pump. Usually what happens is that the main shaft in the mechanically driven gear pump snaps, leaving you on the side of the road and cursing for days trying to find out why your engine will not start but for a few moments then quits.