ledhedsymbols Posted October 28, 2004 Share Posted October 28, 2004 First a little history: About two weeks ago, my 83 Brat died in Edmonds while I was on my way to go fishing. After many bad words, I finally had it towed to SubaruTex's place ( I live in Bremerton) and I began troubleshooting (Big thank you to Tex and his mom!) I tracked it down to what I believed to be a faulty fuel pump. I jetted down to the neighborhood Schucks, bought and installed a new pump and YAY GO ME! It ran just fine, until yesterday. It died on me again while I was on my way back from work. Luckily I managed to get it going again and made it home where I have not been able to start it again. Currently: There is no fuel in the front filter, and I can't hear the fuel pump kick on when I switch on the ignition.... What is there in line with the fuel pump electrically (I am leaning towards electrical problems) and how can I test it? Thanks in advance... It would be in Tex's garage again, but for now, it is parked at home in Bremerton, and I am driving the other car as a commuter. To top it all off, I can't take that one fishing! HELP PLEASE Quote Link to comment Share on other sites More sharing options...
BobBrumby Posted October 28, 2004 Share Posted October 28, 2004 I have red in a post that the fuel pump gets power when the altinator is spining with the key in the on possition. Just run a wire from the pos side of battery to the non ground wire on the fuel pump to test it. Quote Link to comment Share on other sites More sharing options...
edrach Posted October 28, 2004 Share Posted October 28, 2004 Aside from finding the electrical problem, I hope you changed the fuel filter while you were replacing the pump. First a little history:About two weeks ago, my 83 Brat died in Edmonds while I was on my way to go fishing. After many bad words, I finally had it towed to SubaruTex's place ( I live in Bremerton) and I began troubleshooting (Big thank you to Tex and his mom!) I tracked it down to what I believed to be a faulty fuel pump. I jetted down to the neighborhood Schucks, bought and installed a new pump and YAY GO ME! It ran just fine, until yesterday. It died on me again while I was on my way back from work. Luckily I managed to get it going again and made it home where I have not been able to start it again. Currently: There is no fuel in the front filter, and I can't hear the fuel pump kick on when I switch on the ignition.... What is there in line with the fuel pump electrically (I am leaning towards electrical problems) and how can I test it? Thanks in advance... It would be in Tex's garage again, but for now, it is parked at home in Bremerton, and I am driving the other car as a commuter. To top it all off, I can't take that one fishing! HELP PLEASE Quote Link to comment Share on other sites More sharing options...
Sweet82 Posted October 28, 2004 Share Posted October 28, 2004 Shortly after I finished the Buggy, all the sudden it quit I had the same solutions you did, they didn't work either. I traced my problem to the Fuel Pump Control Unit under the dash. The FPCU had given up the ghost and was not sending a signal to the pump. I'd give a good look at that FPCU of yours! Good Luck, Glenn 82 SubaruHummer--now with a modified FPCU 01 Forester Quote Link to comment Share on other sites More sharing options...
ledhedsymbols Posted October 30, 2004 Author Share Posted October 30, 2004 Yes, I did change both filters when I replaced the pump... Where is the FPCU under the dash, and how does it work? Quote Link to comment Share on other sites More sharing options...
edrach Posted October 30, 2004 Share Posted October 30, 2004 If I remember correctly it's a rectangular box about 4"x4"x1" mounted just under (or over?) the steering column. I haven't a clue how it works, but the posts are correct in that it delivers power to the fuel pump. Yes, I did change both filters when I replaced the pump... Where is the FPCU under the dash, and how does it work? Quote Link to comment Share on other sites More sharing options...
subusolo2nut Posted October 30, 2004 Share Posted October 30, 2004 If I remember correctly it's a rectangular box about 4"x4"x1" mounted just under (or over?) the steering column. I haven't a clue how it works, but the posts are correct in that it delivers power to the fuel pump. The Fuel Pump Control Unit looks at the tach signal & keeps a relay closed to supply power to the fuel pump--Fed mandated to shut the fuel off if the engine stops for more than a pre-set period of time (about 30sec)--I have replaced it with a Chev Vega oil pressure cut-out switch (opens a circuit when the engine has zero oil pressure)--this "switch" & a relay works better than "uncle sam's" mandated idea---use the "switch" to create a ground for the relay--Relay powers fuel pump--no oil pressure=no fuel pump---simple:) Second note--earlier cars used the alternator signal to trigger the fuel pump relay--I can't remember the year that Subaru changed to tach signal--I know that my '82 used tach not alternator pulse for the trigger--- Dean Quote Link to comment Share on other sites More sharing options...
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