engine is stalling, apparently due to low fuel pressure. Guage reads 45 -60 psi when first started, then as engine runs pressure gets lower until engine stalls from lack of pressure. (About 20 psi or so.) After a 30 second wait, pressure comes up and starts again.
With ground leads from rear fuel pumps disconnected from battery, there is no pressure or fuel. When connected, pressure comes up - I disconnected the ground lead from the h.P. Pump (so I can hear) and I do hear the pump in the tank whirring. Seems like a fuel volume issue. This truck has twin tanks - could the selector valve between the tanks be the culprit?
Other causes for low fuel volume to the high pressure pump?
No apparent kinks or restrictions in the fuel lines, new fuel filter, new h.P. Pump (was making bearing noises with erratic fluctuations in pressure - sounded like it was on a failure path). Rear tank pumps replaced about 1.5 years ago.
Need to get running as is a work truck and I am losing money by the hour.
Wednesday, May 1st, 2019 AT 7:15 PM