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12 volts direct to fuel pump relay plug,no fuel pump hum

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Old 09-01-2017, 07:51 AM
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Dash switch ?
Even if you have a single tank, some still have the plug for a switch with a factory jumper that plugs in in place of a switch.
Check a wiring diagram and see where the power goes after the inertia switch.
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Old 01-17-2019, 11:44 PM
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Originally Posted by techrep
What was the original problem that made you change the fuel pump ?
the original problem was it was not holding pressure. After running the truck the pressure would drop straight to zero after turning it off. Even when it was on, it only was at about 30 psi and 28 is the lowest in the recommended amount. The new fuel pump runs at about 38 and holds pressure.
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Old 01-18-2019, 12:16 AM
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Did you change usernames?
Originally Posted by Red4x
...the pressure would drop straight to zero after turning it off.
Key-off pressure is irrelevant.
Originally Posted by Red4x
.Even when it was on, it only was at about 30 psi and 28 is the lowest in the recommended amount.
I've driven on ~12psi (as it was running out of gas).
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Old 02-06-2019, 07:27 PM
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Default Fuel pump
Originally Posted by icu1954
thinking about going back to the fuel pump pigtail close to the tank and run test wire straight to the battery and see if fuel pump runs.then i'll know it is in the wiring.
That’s what I did to mine and found out that it’s something in the wire/wire harness.
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