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I have a 1999 Ram 3500 with 24v Cummins. I installed a new external lift pump not long ago, and now no fuel. I started the truck to go fuel up. As is was a cold-ish morning, i revved up a bit, and it died. I have a fuel gauge in the cab, and it did not register when I turned the key to start again.
I disconnected the connector at the pump, with KO I have 10v m/l, and a good ground. Using a power probe, the pump would come on, but no fuel pressure. Re-connected the harness, pump did not come on.
I saw something about a rollover valve at the tank, possibly vacuum in tank. Is there anything else to check? I can't find anything helpful on the web, all they do is plug in new parts. I am pretty sure it's the pump, I went cheap this time, but I want to be sure before I go through all of that again.
Load test the circuit with a comparable load (fuel pump probably around 9 amps). Power Probe is okay for providing power and ground. It’s terrible as a measuring tool and for checking grounds and ability to carry load. Ive has power probe tell me I had a good ground and yet couldn’t even light a test light.
10V is really low. Especially not during crank. What is battery voltage?
You can use a headlight or 2 (depending on what amperage the bulb you’re using draws) on power and ground wire at the fuel pump with the pump unplugged and see if it lights.
Making Pressure Differential Sensors (PDA Sensors) for pressure pulse diagnostics.
Currently servicing Central Texas.
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