Ford F150 Forum - Community of Ford Truck Fans
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Ford F150 Forum - Community of Ford Truck Fans (https://www.f150forum.com/)
-   1987 - 1996 F150 (https://www.f150forum.com/f10/)
-   -   12 volts direct to fuel pump relay plug,no fuel pump hum (https://www.f150forum.com/f10/12-volts-direct-fuel-pump-relay-plug-no-fuel-pump-hum-392771/)

Chris_1 09-01-2017 07:51 AM
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.

Red4x 01-17-2019 11:44 PM
Originally Posted by techrep (Post 5449032)
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.

Steve83 01-18-2019 12:16 AM
Did you change usernames?
Originally Posted by Red4x (Post 6057644)
...the pressure would drop straight to zero after turning it off.
Key-off pressure is irrelevant.
Originally Posted by Red4x (Post 6057644)
.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).

Grant4910 02-06-2019 07:27 PM
Fuel pump
 
Originally Posted by icu1954 (Post 5448417)
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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