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Old 07-05-2017, 09:21 PM   #453
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Join Date: May 2005
Location: Otsego, MI
2005 STI
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Originally Posted by gsrcrxsi View Post
this is probably why you're killing pumps. you're over volting it.

I've read through the description of the JMS unit and can't see how it helps if youre not sagging voltage below 12V under load.
Sorry for late reply to this.... I confirmed with Walbro (Jeff at VE Petersen) the pumps can handle the voltage increase. He sent me a chart that shows flow with different voltages up to 20V.

Crazy as it sounds... my problem ended up being a bad 100 amp fuse.. the center conductor (fuse link) broke away from the end cap causing low current when the fuse heated up... The failures were occurring at the gas station just after a fill up.. had car towed home after last failure.. let it cool down... and the fuel pump started working again.. I pulled the fuse from the holder and one of the end caps stayed in the holder... upon inspection of the connection points I could see where it had been arcing. I replaced the fuse and all is good.
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