| Re: [GMCnet] Re: Looking for electric fuel pump control [message #367180 is a reply to message #367176] |
Tue, 12 October 2021 15:42   |
Christo
Messages: 109
Registered: April 2019
Location: Weymouth, MA
Karma:
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Senior Member |
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...and even if you jumper the outer terminals of the isolator (or have a combiner), the alternator output feed would still be dead along with your fuel pumps. Wiring in an override switch would work, but it would carry the risk of leaving the switch in the override position, thus defeating the safety feature. At least if such a switch were illuminated you'd be likely to notice when it was in the override position.
I vote for using oil pressure. That's how the PO set up the aux electric fuel pump on my coach, using an oil pressure switch and a relay so that the pump will only run when switched on and there's oil pressure. The only thing I don't like is that I have a "tree" coming out of the oil pressure port with one switch and two senders (for aftermarket dash gauge and DigiPanel. It's ugly.
Some folks have also used a "crash sensor" switch based on an accelerometer -- I don't know the OEM brand / part number -- to kill the pumps if there's an accident.
Christo Darsch
GMC Nor'easters
1977 Eleganza II - "The Komet"
3.50 Power Drive, Disc Brakes, Alcoas
Weymouth, MA
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