We then went to my shop and got on my AllData Online computer to compare the data. Like what they ask when you go to the parts place for parts. Also after fuel pressure is built up pinch off the pressure line from fuel pump to check if pump is leaking back. The more consistent information I am reading says 60+ psi with the pump on, and as soon as its off, it is suppose to hold within 10 percent of that amount for 20 minutes. Wouldn't it be strange to find out that the system isn't even checked until the fp relay fails? Checked the frame ground for the fuel pump and it is seems in good order. Their mechanics had gone home and they couldn't look it up anywhere. I'll post back with the results.
To my amazement the diagrams are exactly the same. . Is it possible that the I mixed the two grounds up or is something else causing this? It looks to me like that checking the fuel pump relay control while engine is running or truck is being drove down the road will tell the story on the system. But if anyone has had any experience with these engines and can point me in the right direction, I would greatly appreciate it. Is there a smaller gauge yellow wire connected to a terminal somewhere near the center? When the oil pressure reaches about 28kpa 4psi through the cranking and the fuel pump relay does not complete the circuit, the oil pressure switch will close to complete the circuit to run the fuel pump. Then shut it off and watch for fast leak down.
I also verified the distributor was in fact in the correct location. If a switch is shorted, the pump will keep running the battery down when the car is shut off and you would not be reading this thread. The straight wire done the same thing, engine cranked ran about 2 seconds and the injector fuel flow stopped. I went one tooth back and one tooth forward just to make sure and it barely ran in those positions. The ecm powers up the fp relay providing power to the fuel pump to start the engine. I talk to Advance Tech, said they were same except brand name?? The pump cycles for the normal 2-3 seconds and I have 60 psi.
Its primary function is to maintain a constant fuel pressure at the fuel injectors. This filter is used on the in tank fuel pump systems, where the fuel supply lines are under pressure. The engine couldn't start immediately but 5 to 10 minutes later, it could start again. All the regulators I've ever seen are just a spring loaded diaphragm that bleeds fuel off into the return line when pressure on the diaphragm exceeds the spring pressure. The minimum idle air rate is set at the factory with a stop screw. The main control sensor is the oxygen O-2 sensor, which is located in the exhaust pipe. Clear Flood Mode: If the engine floods, clear it by pushing the accelerator pedal down all the way.
I almost wonder if the cat is plugged? A lot of newer systems over 2000 up have done away with oil pressure switch to power fuel pump. Gear on the bottom of the distributor was installed wrong during the rebuild. If I start out, it will have good power and sound normal for about a half of second, then you can feel the power drop right off and the engine just doesn't sound right. Hit us with all info. Jonnick's son's veh has or had a faulty most likely intermittent fuel pump relay circuit.
I talk to Advance Tech, said they were same except brand name?? I took some time today to put together the information covering the different fuel delivery systems and how they work on the P-30 Series Chassis. Im not sure what this is I ruled out many possibilities such as a spun bearing either that or or a crank bearing. The pump cycles for the normal 2-3 seconds and I have 60 psi. What do you think after reading this?? I have a 96 chevrolet C3500 with the 7. They are a subject in themselves.
If the fuel pump relay fails, it is backed up by the oil pressure switch, which continues to operate the fuel pump as long as oil pressure remains above 28. Where can I get a wire diagram? My guess is you have at least one flat cam lobe. For that timeline and cost, I may be better off just replacing items and hope I get it right. But with pressure at the limit of not being enough, anything is possible. On the 305, the single 3 prong switch serves both these functions. It does have battery power at relay.
Replaced the relay with same results. When I change out the relay it will start back up. Now comes the part about how the ops can and will shut fuel pump. An hour later I had to go outside so I figured I'd try to start it again. The engine couldn't start immediately but 5 to 10 minutes later, it could start again. I put everthing back to normal.