Fuel Pump Wiring
Asked by Martin May 19, 2018 at 08:55 PM about the 1995 Ford Mustang Convertible RWD
Question type: Maintenance & Repair
HI all. I am trouble shooting a crank with no start. Using information here I
have ruled out much so I'll keep this question simple. Is the fuel inertial
switch the "last stop" before power to the fuel pump? I have reason to believe
I may have a bad connection to the fuel pump but I have 12 volts at the
switch and no pump running when I jump the switch. I just want to know if
power to the inertial switch confirms that everything under the hood is good.
If so, I'm only trouble shooting wiring between the switch and pump. Thanks
for any help you can provide. 1995 Mustang 3.8
12 Answers
Yes. As stated I have 12V at the switch and I used a jumper wire on the switch connector and still no power to the pump. Just trying to find out if the inertial switch power then goes straight to the fuel pump.
Yes. Really just need to know if the power goes directly from that switch to the fuel pump.
New pump installed so I'm thinking I need to test the wiring from the inertial switch to the pump harness. Any thoughts?
Did you ever get that worked out? I'm in the same boat right now.
GuruC9L3J, I ended up changing the fuel pump relay again. When I decided that everything SHOULD have been working based on my trouble shooting, I considered that a bad part could still be the culprit. Sure enough, a relay that I already replaced was bad. Sorry, that's probably not much help.
What relay and where? I changed ccrm yesterday (it was in rough shape), but no change. I've jumped the wires for inertia switch, it has power when green/yellow is by itself. Then no power as soon as I join it with been/pink.
I was led to believe that all the relays were in the CCRM. But mine has a starter relay in the fuse box that 's under the hood.
Finally found it! The wires in the plug to a/c high pressure shutoff were bare and corroded. I need to buy a new harness, but re-wrapping the wires individually with electrical tape to fix the short to ground got power back to the fuel pump.
