| Re: Alternator to power fuel pump? [message #370443 is a reply to message #370442] |
Fri, 02 September 2022 10:08   |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma:
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Senior Member |
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I want to thank all that answered. All of the replies were valuable.
What I really want an set up where the fuel pump can't run with the engine off. I considered lots of things like NO LOP switch, but I don't have one on the shelf.
The Carter 4070s have been around for a long time and they can't be brushless, they are just too old. They can't be too voltage sensitive because some of the applications where they have been were really strange voltage wise.
My plan is to use the current selector valve switch to control a standard ISO cube relay as they are SPDT. Energized will put power to the Auxiliary pump.
What I like about this plan is:
1-The relay is in my stock
2-There is only one component in the control system.
For background, I have a diagram drawn up for a control system with a multi diode AND gate (True and not AND/OR), a delay relay three relays. Yes this provided an auto prime feature for starting, but it has a dozen components and fourteen failure modes. (Yes, I wrote a quick FMEA.)
As it turns out, 23footers don't have a lot of room to mess with putting these things in. The gas tanks are 4 feet closer to the engines, so I'm planning to mount the pumps to the underside of the wood floor.
I will be sure to let everybody know how this works out.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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