1999 fuel pump wiring has 6.7 volts - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 4 (permalink) Old 11-10-2013, 06:51 PM Thread Starter
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1999 fuel pump wiring has 6.7 volts

The 7.3 fuel pump on the left frame rail was replaced recently, I tested the power to the pump it has 6.7 volts, checked at the kill switch, I have 6.7 volts there I can not find the relay or trace the wire back to the sourse.

1988 ford van fresh overhaul, 1991 nissan pick-up 1993 Caprice 2000 GMC S10 Blaser 2007 nbs 3500 GMC 4x4 crew-cab long box 17 inch single wheels Duramax Alison. BW turnover Ball. Furakawa FL35 loader. Retired, HD mechanic, worked on engines all my life. Fabricator welder. electrician. in the process of finishing my new shop. Live in Rock Creek B.C. Wife has a fruit stand.
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post #2 of 4 (permalink) Old 11-12-2013, 10:26 PM Thread Starter
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I figured it out.

1988 ford van fresh overhaul, 1991 nissan pick-up 1993 Caprice 2000 GMC S10 Blaser 2007 nbs 3500 GMC 4x4 crew-cab long box 17 inch single wheels Duramax Alison. BW turnover Ball. Furakawa FL35 loader. Retired, HD mechanic, worked on engines all my life. Fabricator welder. electrician. in the process of finishing my new shop. Live in Rock Creek B.C. Wife has a fruit stand.
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post #3 of 4 (permalink) Old 11-13-2013, 02:47 AM
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what did you find?

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post #4 of 4 (permalink) Old 11-13-2013, 06:41 PM Thread Starter
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It is trace voltage, the pump had 450 OHMs resistance, new is .5 OHMs. The power control modual, sends out the voltage to check the circuit, if it is OK then it grounds the relay sending full power.
It took a while to figure all this out as information is hard to find.
Just a thought!

1988 ford van fresh overhaul, 1991 nissan pick-up 1993 Caprice 2000 GMC S10 Blaser 2007 nbs 3500 GMC 4x4 crew-cab long box 17 inch single wheels Duramax Alison. BW turnover Ball. Furakawa FL35 loader. Retired, HD mechanic, worked on engines all my life. Fabricator welder. electrician. in the process of finishing my new shop. Live in Rock Creek B.C. Wife has a fruit stand.
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