I got a GN here I'm working on. It will not build fuel pressure. What I know it's not so far:
1. fuel pump...has double pumper. Jumping second pump does not solve issue.
2. regulator. replaced with known good one.
3. gauge. checked with two gauges...one of which is known good.
Car has a dead cylinder. Not a spark issue. Checked that. Has injector pulse at that cylinder. Plug gets very wet even with harness disconnected from that injector. Car is an '85 with an '87 conversion. I did notice they forgot to plumb in a fuel filter.
Fuel pressure only goes to 20psi or so with the pump running and car off....no matter how much regulator is cranked down. Will a stuck injector (80lb injectors) cause that much of a fuel pressure issue? Pressure goes to zero instantly when pump is shut off. It also takes it a few seconds to get to 20psi when pump is fired up.
1. fuel pump...has double pumper. Jumping second pump does not solve issue.
2. regulator. replaced with known good one.
3. gauge. checked with two gauges...one of which is known good.
Car has a dead cylinder. Not a spark issue. Checked that. Has injector pulse at that cylinder. Plug gets very wet even with harness disconnected from that injector. Car is an '85 with an '87 conversion. I did notice they forgot to plumb in a fuel filter.
Fuel pressure only goes to 20psi or so with the pump running and car off....no matter how much regulator is cranked down. Will a stuck injector (80lb injectors) cause that much of a fuel pressure issue? Pressure goes to zero instantly when pump is shut off. It also takes it a few seconds to get to 20psi when pump is fired up.