argyll_eng Posted July 23, 2011 Share Posted July 23, 2011 88 Comanche Pioneer 4.0 Auto 130000 miles. Stuck in South Dakota with no vehicle. So far I have replaced; Ignition switch Fuel pump ballast Fuel filter Spark plugs Spark plug wires Dist Cap Rotor Ignition Coil Crankshaft position sensor The truck still turns over and runs while the key is in the start position but as I release the key to the run position it dies out. I have to drive back to Colorado in a week and am needing to get this truck running again so I can at-least make it home. Any ideas are greatly appreciated. Link to comment Share on other sites More sharing options...
HOrnbrod Posted July 23, 2011 Share Posted July 23, 2011 Try swapping out your fuel pump relay; sounds like it's not latching when you go back to the RUN position. To verify have a helper with a volt meter monitor the voltage at the fuel pump terminals and verify that B+ voltage remains at the pump when you go to the RUN position. Link to comment Share on other sites More sharing options...
argyll_eng Posted July 23, 2011 Author Share Posted July 23, 2011 Forgot to mention I replaced all 4 relays in the relay center as well as cleaned all connections with quick dry electrical cleaner. Should I still check anyway? I also had run a jump wire from the battery to the fuel pump wiring. When I put the wire to the first terminal the pump runs. At the second terminal there is nothing and the third Is the ground so I didn't put the jump wire to it. Link to comment Share on other sites More sharing options...
HOrnbrod Posted July 23, 2011 Share Posted July 23, 2011 I would still do the voltage check at the pump in the START and RUN ignition switch positions. Link to comment Share on other sites More sharing options...
argyll_eng Posted July 23, 2011 Author Share Posted July 23, 2011 Problem solved. There is a problem with the fuel pump relay housing. Ran a jump wire from the pos terminal to the switched wire on the relay and she started right up. $800 bucks in unnecessary parts later the Comanche is back in business. All I needed was $10 bucks in 12 gauge primary wire and a toggle switch and I would have been mobile two months ago. Link to comment Share on other sites More sharing options...
HOrnbrod Posted July 23, 2011 Share Posted July 23, 2011 Problem solved. There is a problem with the fuel pump relay housing. Ran a jump wire from the pos terminal to the switched wire on the relay and she started right up. $800 bucks in unnecessary parts later the Comanche is back in business. All I needed was $10 bucks in 12 gauge primary wire and a toggle switch and I would have been mobile two months ago. Amazing. Fuel pump relay problem. Link to comment Share on other sites More sharing options...
dakal Posted July 23, 2011 Share Posted July 23, 2011 win win Link to comment Share on other sites More sharing options...
jimoshel Posted July 23, 2011 Share Posted July 23, 2011 Model T's running with gravity feed fuel systems didn't have that problem. Progress. Link to comment Share on other sites More sharing options...
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