 No Power to the Fuel Pump, Using Brad's Flow Charts |
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| cary |
 Feb 5 2006, 10:41 PM
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#1
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Advanced Member  Group: Members Posts: 3,900 Joined: 26-January 04 From: Sherwood Oregon Member No.: 1,608 Region Association: Pacific Northwest 
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Well the kids car quit running yesterday afternoon. My thinking was the fuse had popped out. NOPE. Then the fuel pump had died. Can't tell.
I don't have 12volts at the pump. Not even for 1.5 seconds. Using Brad's trouble shooting flow charts. http://members.rennlist.com/pbanders/FPChecklist.htm Using the Isolate flow chart. I get to the bottom right corner. It asks to connect the DMM to PIN III on the small white ground harness at the back left corner. Is he asking that the connector be in the board socket or in my hand ? Either way I never get a ground signal. Should I have 12 volts at the pump all the time ? Or does that 1.5 seconds of ground just open the relay. Somewhere in Elec 101 that didn't sink in. I don't know how to read the relay switch diagram. Next should I be able to bench test the 3 fuel pumps I have ? |
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| SirAndy |
Feb 6 2006, 01:34 AM
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#2
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Resident German Group: Admin Posts: 41,625 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
jumper the pump for testing. put 12V straight from the battery to it and see if it runs. run a separate ground wire also, just to be sure.
did you switch relays? simply take one of the headlight relays and try. make sure it fits snug. if it feels too lose, pry the contacts open a bit. i'd suspect the relay before the pump ... (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif) Andy |
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| mrobin |
Feb 6 2006, 05:13 AM
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#3
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Member Group: Members Posts: 69 Joined: 1-August 04 From: boynton beach fl Member No.: 2,425 |
I just had the same problem last month, what andy is saying worked for me.
I switched relays from the headlights, and it didn't work....but I put in a new relay and the pump worked fine. mike |
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| cary |
Feb 6 2006, 08:14 AM
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#4
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Advanced Member Group: Members Posts: 3,900 Joined: 26-January 04 From: Sherwood Oregon Member No.: 1,608 Region Association: Pacific Northwest
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Re-arranged the relays before I started the trouble shooting. That didn't work.
The batterys weren't strong enough to test the 3 other fuel pumps. Used the battery charger and that worked. But I followed Brad's flow charts to the next level. Came to bad traces on the relay board. So I switched out the relay board. Started right up. But, I switched around the relays again. Just for s**** & giggles. Didn't start. So that bitch went in the garbage. Maybe, just maybe I had a bad one in the wrong spot while I was trouble shooting. I was using about 8 of them. Thanks Brad for all your great work. |
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