F.ound O.n R.oad D.ead
My buddys 89 4.3 tbi has a fuel pressure of 12 psi at idle and when he revvs it to Wot it drops to about 9, and with the return line clamps it stays still at 12 psi. his check valve is gone because with key on and truck off the pressure drops quick. but this does mean he does need a pump right? filter is good.