Sublime
Full Access Member
- Joined
- Oct 7, 2016
- Posts
- 169
- Reaction score
- 60
- Location
- usa
- First Name
- m
- Truck Year
- 1978
- Truck Model
- k10
- Engine Size
- 350
Or should I say noise at the fuel pump? So my 78 k10 350 developed a ticking/knocking noise. The noise is only heard below 1000 rpm and after the engine is at operating temp. Engine oil pressure is at 30psi at idle and 70psi at 2500 rpm when warm. So I am pretty sure its not a rod or main bearing. Started diagnosing by removing one plug wire at a time while the engine was running, the noise did not go away, I then removed both valve covers and checked lifter adjustment, noise was still there. I cannot tell where the noise is, it seams to be louder when I crawl underneath. A friend of mine lent me his stethoscope. I listened to the valve covers, intake manifold, header tubes one by one, transmission, oil pan, flex dust cover water pump, ps pump and finally the mechanical fuel pump. No doubt the noise is either the fuel pump OR something very close to the fuel pump.
Has anyone ever experienced this? The pump is obviously working and not leaking.
Thanks in advance
Has anyone ever experienced this? The pump is obviously working and not leaking.
Thanks in advance