What is the correct voltage from relay to inertia switch. I have 12+ volts into relay, and 6.4 volta to inertia swith and pump. Is that enough volts to run pump?

Asked by Dec 05, 2015 at 11:41 AM about the 2001 Mercury Grand Marquis LS

Question type: Maintenance & Repair

engine cranks-no start. Spark test good. runs on carb cleaner. Low voltage
from relay.

2 Answers

1,615

I doubt it. Replace that relay!

Turns out the (bad) fuel pump ground was causing the drop in voltage. I replaced the pump by jacking the diff up as high as I could, and then placing jack stands under the frame and then dropping the diff. This created plenty of room the remove the fuel sending unit. I cut the 3 wires for the gauge at unequal length and the soldered and heat shrink sealed after installing the new pump. Entire job took about 1-1 and half hours.

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