oil leaking from mechanical fuel pump

[David63]

Any idea why oil would be leaking for the fuel pump? Its not leaking from the gasket where it attached to engine, the pump itself is leaking. I replaced the last pump thinking it was the pump, now the new pump leaks. How is oil getting up in the pump? Do I have crank case pressure pushing it in due to bad PCV?

 

[reamer]

Torn diaphragm oil leaking = gas into the oil, thinning it out....

 

[Steve83]

Oil is supposed to splash from the crankcase into the fuel pump to lubricate the lever's pivot. But there should be a seal between the lever & the weep hole on the pump body.

 

[SteveL]

Sure it's not from the oil pressure sender?

 

[clinem03]

If it is the coming from the pump and not the oil sending unit, it is likely coming from the weep hole on the side of the fuel pump. I've had two blow out on me...either due to faulty pump or because there is too much crank case pressure and it is pushing the oil past the seal and out the weep hole. This thread may help -https://classicbroncos.com/forums/showthread.php?t=311555