newgen85brat Posted January 21, 2012 Share Posted January 21, 2012 Guys, I am working on a non running brat. I got the replacement engine installed. After sitting for 15 years, it lives! But only until the starting fluid runs out. I am not getting fuel. I put an 83 EA81 in it and was wondering if the fuel pump has to get some sort of signal to turn on. I have yet to test the circuit but was just wondering if the fuel pump is always on (when it demands) or if something in the wiring tells it to turn on at a certain time and the older engine may not be sending the signal. At worst case I will put an new fuel pump in or rewire it or both. Please tell me what you know. thanks. Link to comment Share on other sites More sharing options...
naru Posted January 21, 2012 Share Posted January 21, 2012 The special fuel pump relay in your car needs to see ignition pulses to run the pump. Make sure all the wires are still on coil negative. You should have 12V at the pump w/cranking. Link to comment Share on other sites More sharing options...
Cougar Posted January 21, 2012 Share Posted January 21, 2012 You should be able to hear the pump run for a couple od seconds when you turn the ignition switch to the RUN position. If you don't then you need to check the fusible links and fuses for a problem there. If that is ok then the relay needs to be checked. The pump will shut down if the ignition isn't working but it sounds like that isn't your problem here. Regardless you should be able to hear it turn on with the ignition switch as I stated. Link to comment Share on other sites More sharing options...
naru Posted January 21, 2012 Share Posted January 21, 2012 Could be wrong,but,I don`t think the carbed cars run the pump at all w/o cranking. Link to comment Share on other sites More sharing options...
GeneralDisorder Posted January 21, 2012 Share Posted January 21, 2012 The FPCU runs the pump for 1.5 seconds at key-on. Then waits for a tach signal. GD Link to comment Share on other sites More sharing options...
newgen85brat Posted January 22, 2012 Author Share Posted January 22, 2012 Where is the fuel pump relay and how do I check it? I bought this from a guy who just wanted to beat it and as far as I can tell did a lot of half-a**ing it. I put the wires back on the coil and the tach does move when I crank it. Should I have someone crank it while I test for power at the pump? Did switching years of motors have anything to do with it? Thanks, baffled in Iowa. Link to comment Share on other sites More sharing options...
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