Inertia Switch, Fuel Pump, Electrical. Please help. - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 06-07-2013
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Inertia Switch, Fuel Pump, Electrical. Please help.

While driving the other day, my Ford Ranger suddenly quit running. Truck would crank but not turn over. Luckily close to home. Upon examining, friends realized a possible fuel pump or electrical issue. A computer diagnostic revealed "Primary Fuel Pump Circuit HIGH" and "Secondary Fuel Pump Circuit HIGH." Replaced fuel pump with new, however, fuel pump would not activate... Upon deeper investigation, the inertia switch was assessed and the inertia switch had been triggered. Inertia switch was reset. Fuel pump received power and the truck ran... My questions now are...
Upon electrical assessments, battery had 12.4V. At the fuel pump, there was only 11.4V??? Now that was without the engine running...
Relays and fuses all looked good from the looks of them... Could there be an electrical issue, a bad relay/fuse, or can the inertia switch be going haywire...
I would hate to have a break down again, especially further away from home...
Thank you!!

2005 Ford Ranger Edge 4X4
4.0L 6cyl SOHC engine
25,000 miles...
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Old 06-07-2013
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do like i did, cut the wires and connect them together, problem solved, it was more of a hassle for me to have it
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Old 06-07-2013
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Quote:
Originally Posted by DangerRanger96 View Post
do like i did, cut the wires and connect them together, problem solved, it was more of a hassle for me to have it
Do you believe it was due to the inertia switch or could I have an open circuit, short circuit, a cause of the voltage loss...
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Old 06-07-2013
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Originally Posted by Flashover2607 View Post
Do you believe it was due to the inertia switch or could I have an open circuit, short circuit, a cause of the voltage loss...
Id say it was the switch
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Old 06-10-2013
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Happened again today. Died while driving. I immediately went to the inertia switch once it died. Did not even try to restart the truck. Depressed the inertia switch, flipped the ignition and fired right up.
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Old 06-10-2013
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disable it!!!!!
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Old 06-18-2013
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check the electrical connector at the inertia switch. I've seen quite a few of them burned up.
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Old 12-20-2016
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For everyone with no start due to pump not receiving current via the inertia switch. I never had a problem with my 2001 Ranger Edge until I hit a depression in a a parking lot that sent my truck upward and coming down hard at a slow speed. The inertia switch went bad shortly after that and the oil pressure switch went bad immediately. I replaced the inertia switch after 14 years with one from Auto zone for $30.00. It has worked fine until we had cold weather and snow getting on top of my tank. I did the turn the key trick several time and then it started like always. This switch is very sensitive and now I plan to replace it cause its under lifetime warranty. So if theirs a short I guess ill have to wait till spring cause its cold to remove the rear bed . I guess weather could short it out but it occurred after dropping a 50 lb bag of salt in front of the passenger seat. Go figure a thump is all it may take to interfere with this switch the very next day. Good luck to all & if it continues Ill just keep changing until the fuel pump really doesn't work.
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