Quote
...Another possibility is an air leak in your fuel line which in some cases can let air in without any fuel leaking out. This can starve the pump to the point of killing the engine....


I had this problem once with a diesel Jetta I had...MAN, was it tricky to find. I put the clear plastic line in the return line, and found air, then no fuel returning, the motor would die out, then mysteriously start pumping again...finally traced it to where the fuel line hooked to the pump. Seems the line has another line over it (likely to reduce flexing and fatigue), and after 10 years the hose swelled a bit and sucked air in where it slid on the fitting. Nothing ever leaked out, just air in.
I cut 1/2" off the line and problem cured!

1994 Chev S10 Ext.Cab with C223 5spd
1991 S10 Sonoma Ext.Cab with C223 5spd - SOLD

Kubota B6100 diesel with accessories