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Hello, Eddie here and I will do my best to help. I believe what your question basically asks, is how to check fuel pressure? Is that right? Fuel pressure is tested with a fuel pressure gauge that is screwed to a schrader valve (similar to where you put air in a tire at) that is located on the fuel rail, you then turn the key on, or crank the engine, and watch the fuel pressure gauge, your fuel pressure in that 7.5 gas engine should be around 35-40 psi with key on engine off, But if you do not hear the fuel pump run at all with your ear near the tank and turning the key on, (it should prime for a couple of seconds and run constantly when cranking) Then likely there is one of two problems, No power at the pump, or the pump itself has failed. Do you have a voltmeter or test light, What I would suggest is, checking power at that fuel shutoff switch, if there is power there, then we know the fuel pump relay is good, however, if there is no power there, then it's likely not the pump but a power supply issue. Let me know, Thank you.
Yes you can, but it's difficult to know how much pressure is really there. If the pump is weak, and you only have 5 lbs. of pressure, then it wouldn't start, but, it would be helpful to know if there was any there, because if there was any, then likely you do have battery voltage to the pump when cranking, I would take it loose at the filter, and put the end in a bucket, that usually keeps the mess down.
or you can find the schrader valve at the rail, push it with a small screwdriver and turn the key on, then gas sprays everywhere, again, thats messy, but you wouldn't have to undo any lines then.
OK, I follow you. It's either the pump itself, or a power suppy problem. I would get a cheap 12 volt test light (They are fairly cheap at any auto parts store) and just make sure you have power at the fuel pump safety switch when cranking, If you have power there, then likely you do have it at the pump, Before you replace the pump I would highly suggest verifying you do have power to it. It's probably the pump if you swapped the relay though. Let me know if you have any further questions. Thank you.
Fuel gauge movement means the sending unit is getting powered up, but the fuel pump supply circuit, is a different circuit than the gauge circuit, The pump safety switch is the one on the passenger kick panel. Also known as an inertia switch, that is what you should check power on first when cranking, to be sure it has power there. If it does, then unless there wire is broke between that switch and the pump, then I believe you'll be looking at a new pump replacement.
Did you try to spray it with starting fluid, just to see if it would hit and run briefly then? Just wondering.
Alright, I'd check voltage at the switch, and if you had it there then I would go ahead with the pump replacement. Let me know if you have any further questions. Thank you.
Yes, I've seen that, one mouse can rake havoc!
Hello, Thought I'd follow up with you. did you get the Van running?
Yes, it should be battery voltage . at least 10 volts when cranking, check the yellow wire at fuel pump relay, see if it has battery voltage.