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#1
12-13-2011, 03:48 PM
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97 Chevy Silverado 5.7L Fuel pump relay inttermit
So after tuning it up with plugs wires cap+rotor fuel filter and also a new fuel pump the truck starts fine. After about 10sec it will idle surge. I notice in the fuse box the furl pump relay was clicking on and off. i replace it with a new fuel pump it does the same thing. So i jump a wire from the relay to one of the fuse and the truck idles fine. When i turn off the car the power goes to the fuel pump relay all the time but when i turn on the key there is no power going t the next terminal of the relay. Can someone tell me what is going on with my relay?
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 1996 Mitsubishi Eclipse RS -Red ****UPDATE**** My car is no more! R.I.P. 12/12/05 Mods: 420a DOHC equipped with: bored 54mm throttle, 2.5" cold air intake, 2.5 chrome headers, 2.5 Down Pipe, 2.5 resinator, 5" 2.5 flared muffler, 2.5 custom piping, Megan front & rear strut, Megan rear lower tie rod, Monroe Shocks, Aerospeed coilovers Rollers: 18" TSW Throphy / Pirelli P7000 225/40/18 
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#2
12-13-2011, 04:59 PM
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Re: 97 Chevy Silverado 5.7L Fuel pump relay inttermit
The control circuit for the relay comes from the VCM to relay spade #85. #86 is the path to ground. The relay will energize for 2-3 sec when the key is turned to "run". The relay should stay energized with the engine running or cranking. Why yours is cycling is a mystery. Could be a bad ground feed or power feed from the VCM.
#87 is "hot at all times" from the ECM B fuse. When it's doing this, try wiggling the wires and connectors at the VCM. Did this just happen after the cap, rotor & wires?? What brand fuel pump? Hope this helps some.
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57 Chevy 210 65 Olds 442 Convertible (Another one sold) 75 GMC Vandura 3/4 Ton 1999 K2500 Old Body Style Suburban (Gone but not forgotten) 05 Dodge Ram 3500/5.9 Cummins 2012 Toyota FJ Cruiser
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#3
12-13-2011, 05:02 PM
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Re: 97 Chevy Silverado 5.7L Fuel pump relay inttermit
Quote:
the feed to the fuel pump is separate from the coil control. this goes to the relay contacts that switch power to the pump . coil feed is low amps the contract switching the high amps to the fuel pump. it would also be good to check this with a voltmeter and also check the ignition switch ..
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