1999 Ford Explorer starting issue

[efiles123]

One cold morning the fuel pump would not operate. When turning the key to run the volts to the pump (with plug disconnected) was 8.6 for a second, then dropped to the 6v range. I took the inertia switch from the firewall and back probed the wire going to the fuel pump, getting 12 volts. I went back to the fuel tank and measured the voltage with the key in run position, and read battery voltage. The car started, and has not failed in 3 days. I know it will quit again. I was thinking of replacing the inertia switch and fuel pump relay. Does anyone have more suggestions?

 

[efiles123]

Fuel pump relay and Pcm relay are now replaced. Work good for a few days but started to act up again today when i started it and ran for couple seconds and shut off. I primed it up by turning key part way and it fired right up...

 

[wcjeep]

What is the amp draw of the fuel pump? Compare it to the manual specs. If excessive draw the pump or wiring could be worn out.

 

[decipha]

yeah could be high resistance in the wiring not too uncommon