At idle, remove vacuum hose to fpr and see if it improves. Reapply vacuum hose and see if pressure drops from whatever the hose-off number was. We are looking for variation as a proof of function.Psucamper wrote:So I made up a new 'harness' of ground wires for everything including the brown wires from the double relay and sent them all to a common point on the block.
Gauge pressure was no more than 15 psig!
current suspicion is the FPR is partially stuck/faulty open and won't permit a pressure buildup to a nominal 28 psig. Hate to pull the FPR if there's a diagnostic that will clarify the situation. Next? Bob L.
Now get a pair of vise grips or your fuel hose clamping tool and, at idle, block the hose to the fpr while looking at the gauge. If the pressure reaches 50-60 psi, release! clamp! now! your fuel pump is able to create pressure,
As a general rule, if pump is being starved badly enough to drop the pressure to 15 psi, it will not be able to drive down the street. Inlet line from tank to filter is a very likely culprit. You remove the hose at the inlet of the filter and see that it drains with alacrity. Better yet, if you are unsure, remove the hose from the tank, quickly stick a hose-blocked-with-a-bolt on the tank nipple, and remove, blow through, inspect, replace hose ends, re-install after a quick check of tank outlet itself for any rust or obstruction.
Colin