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How much voltage does a fuel pump need to run on?
Mine is getting about 6V, But does anyone know the bare minimum volts would be?
Last edited by my944; 11-11-2009 at 11:52 AM.. |
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11-11-2009, 11:40 AM
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Cogito Ergo Sum
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I would think that it is a 12v pump as most systems on this car... Now how many amps it needs... That is the question...
Its on a 15amp fuse so... I would guess somewhere in that range... Last edited by porsche4life; 11-11-2009 at 12:07 PM.. |
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11-11-2009, 12:05 PM
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Quote:
Last edited by my944; 11-11-2009 at 12:55 PM.. |
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11-11-2009, 12:52 PM
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Professional Bull5hiter
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Quote:
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Jeff 83 944 Guards Red 23 718 GT Silver |
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11-11-2009, 12:56 PM
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Jeff, I was thinking the same thing.
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11-11-2009, 01:09 PM
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Cogito Ergo Sum
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This car.... Like every other vehicle made in the last 50yrs. Has a 12volt system. Therefor things on them like to run on 12volts...
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11-11-2009, 01:43 PM
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about 5a to run the pump.
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87 951, K27/6, Almond Beige, 17" Turbotwist 87 944S, alpine white, 5sp died a violent death 84 944, silver/brown, auto, gone but not forgotten "may the force be with you" |
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11-11-2009, 06:11 PM
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I'm not quite sure, but where do the amps come into play?
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11-11-2009, 07:51 PM
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Quote:
 Any time you have voltage you have an associated amperage (and resistance and wattage) |
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11-11-2009, 09:43 PM
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get your vehicle up to operating temp and connect/watch a voltmeter connected to the battery while someone turns on the lights, then a/c and watch how the voltage drops because of the incresed draw of amps from the electrical system. the alternator is rated in amps, not volts.
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87 951, K27/6, Almond Beige, 17" Turbotwist 87 944S, alpine white, 5sp died a violent death 84 944, silver/brown, auto, gone but not forgotten "may the force be with you" |
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11-12-2009, 01:26 AM
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Redline Racer
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It might run on 6v, but it's not going to develop full pressure. It's basicly a DC motor, which runs faster the more voltage it gets, and that's because more voltage for a given resistance means more current, which means more power used by the motor, stronger magnetic pull in the motor, more mechanical work done... There's extra resistance somewhere where it shouldn't be (DME relay, fuel pump connections, corroded grounds, fuel pump motor failing, internally corroded wires, etc.), or there's extra drain where there shouldn't be, like a voltage leakage to ground, but not enough to go over 15 amps. I'll bet scenario #1.
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11-12-2009, 08:20 AM
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Yes, any damaged wiring can cause the problems youre seeing.
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Smokey - 1986 951 2.7 liter MID sleeve big bore with Vitesse and CEP parts, Link G4 Extreme, lots more. "The first 50% of the project takes 90% of the time... The rest of the project takes the other 90% of the time." |
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11-14-2009, 08:11 PM
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Quote:
She has a brand new fuel pump, and DME relay. |
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11-22-2009, 07:15 PM
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1986 Porsche 944 2.5l
