Wolfgang Posted August 21, 2007 Share Posted August 21, 2007 My 1988 4.0 automatic will not start. :hmm: I have spark. I have no voltage to the fuel pump when I checked at the connection comming from the engine compartment by the fuel tank with the key on. No voltage at the ballast resister ether. Which relay is the fuel pump relay? Location? :dunno: The schematics that I have are weak concerning the fuel pump :mad: Anyone have a better diagram or schematic :redX: Help! Link to comment Share on other sites More sharing options...
fiatslug87 Posted August 21, 2007 Share Posted August 21, 2007 Fuel pump relay is located on passenger's side inner fender in a bank of 3 or 4 relays usually under a plastic cover (unless removed). If you're standing along side the vehicle, it's the second from the right. 1st- Oxygen sensor heater relay 2nd- Fuel pump relay 3rd- Power latch relay 4th- A/C clutch relay Google Renix manual, this has good information assuming your truck is 1990 or earlier. Link to comment Share on other sites More sharing options...
Wolfgang Posted August 21, 2007 Author Share Posted August 21, 2007 Thank you fiatslug87. Good info. Good advice :thumbsup: Link to comment Share on other sites More sharing options...
jp4lo Posted August 21, 2007 Share Posted August 21, 2007 Are you checking for power while cranking or just w/ the key on? Link to comment Share on other sites More sharing options...
Wolfgang Posted August 21, 2007 Author Share Posted August 21, 2007 I am checking with the key in on position only. Not in the crank position. :wrench: Link to comment Share on other sites More sharing options...
Wolfgang Posted August 21, 2007 Author Share Posted August 21, 2007 I checked for voltage in crank position . Still no volts D.C. :wrench: Link to comment Share on other sites More sharing options...
Pete M Posted August 21, 2007 Share Posted August 21, 2007 Out of curiosity, are you grounding the power wire to the pump's ground wire or to another source of ground? Link to comment Share on other sites More sharing options...
Wolfgang Posted August 21, 2007 Author Share Posted August 21, 2007 Using my Fluke volt meter I am referencing ground at the frame. :wrench: Link to comment Share on other sites More sharing options...
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