C-2 Fuel Pump

[Richard454]

I was headed back from Bowling Green's 10th anniversary festivities a few weeks ago-about 60 miles from home (300 mile drive) and smoke starts bellowing from the pass side. I pull over and find that oil is shooting from the top of the fuel pump at anything over 3k. I limp home on the backroads.

Engine has maybe 1k miles on it. Fresh rebuild w/ high output oil pump. I'm seeing about 80 lbs @ 4k. Fuel pump is an original that was rebuilt years back. I've got a new fuel pump on the way-BUT is this going to happpen again- Am I seeing too much oil pressure? I don't see why the oil would have that much pressure through the top of the fuel pump? Am I missing something?

 

[JohnZ]

There's no oil pressure at the fuel pump - the rod-to-lever interface is lubricated by oil dribbling down the pushrod, and it drains back into the sump. The hole in the fuel pump is an atmospheric vent for the upper diaphragm chamber; if oil is coming out of it, the diaphragm has ruptured. New pump time.

 

[Richard454]

Thanks John- I am going to replace the pump-should have the new one tomorrow. But since you say there is no pressure there- I'm figuring something must be amiss because the oil was streaming upward a foot or so spraying the underside of the hood. Even with the diaphragm ruptured-I shouldn't get that kind of pressure out of the top of the pump should I? PCV system is vented to the carb correctly from the back of the block and off the oil fill tube.

My favorite thing to do when working on my car- Is replace the broken piece only to have it break again because the problem was still there!!! NOT!!