Originally Posted by
3-Liter
Update. Bypassed low pressure pump by disconnecting wires, plugging low press pump output, and plugged VST top vent. Hooked fuel tank directly to the top hose removed from low pressure output. Motor starts and runs without even pumping primer bulb while running. . Fuel pressure 86psi, air 78-80psi. Then hooked fuel tank directly to bottom[input] side of low pressure pump, no start or run. Local auto parts store had China copy of Merc pump, no difference. Checked voltage into low pressure pump, and checked pump coming on. Any possibility other than $400+ low pressure pump from Merc?