pitzel Posted December 26, 2012 Report Share Posted December 26, 2012 I think I have a low fuel pressure issue. See it mostly during winter starting, especially in the cold. Engine cranks, occasional fire, but not enough fuel. Also when commanding lots of power to go up hills it doesn't appear to have enough fuel and sort of misfires. I've replaced the fuel filter. And when I use the Shraeder valve on the fuel rail (3.1L V6) with the fuel pump running (start switch set to 'run'), there's only a minor trickle of fuel -- not a geyser as I would expect. Is there a fuel pressure regulator something I could change? Its a good car but in the Canadian winters (-32C or worse) having it crank, but getting no fuel, is a giant pain. Quote Link to comment Share on other sites More sharing options...
Schurkey Posted December 26, 2012 Report Share Posted December 26, 2012 WHAT YEAR AND MODEL OF CAR??? What is the actual fuel pressure? Use the fuel pump bypass connector to run the pump while testing pressure. When the ignition is turned to "run", the pump only runs for two seconds. If this is your '92 Cutlass, the connector will be in the same harness as the small wire on the auxillary power stud by the battery. Quote Link to comment Share on other sites More sharing options...
pitzel Posted December 26, 2012 Author Report Share Posted December 26, 2012 Can I use a tire pressure gauge to test the fuel pressure at the Schraeder valve on the fuel rail? Or do I have to buy a fancier tool? What should the pressure be? When I go onto Rockauto, the regulators are quoted at 47/48 psi. Does that sound correct? Quote Link to comment Share on other sites More sharing options...
RPE1992GPSE Posted December 26, 2012 Report Share Posted December 26, 2012 Can I use a tire pressure gauge to test the fuel pressure at the Schraeder valve on the fuel rail? Or do I have to buy a fancier tool? What should the pressure be? When I go onto Rockauto, the regulators are quoted at 47/48 psi. Does that sound correct? The short answer to the first part of your question: no. Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted December 26, 2012 Report Share Posted December 26, 2012 the longer answer is: do you like gasoline in your eyes? trust me, it burns.... badly. everybody who does anything beyond oil changes should have a fuel pressure guage laying around, just in case.... at WOT or otherwise no vacuum applied to the FPR, should see around 43.5PSI. Quote Link to comment Share on other sites More sharing options...
pitzel Posted December 26, 2012 Author Report Share Posted December 26, 2012 Are fuel pressure regulators known to fail? Quote Link to comment Share on other sites More sharing options...
EGTGP Posted December 27, 2012 Report Share Posted December 27, 2012 Are fuel pressure regulators known to fail? pull the vacuum line off of the fpr and smell do you smell gas? can also give it the suck test.. Though I wouldn't gas doesn't taste very good either. Cheers Quote Link to comment Share on other sites More sharing options...
19Cutlass94 Posted December 27, 2012 Report Share Posted December 27, 2012 Hook a vacuum pump up to the FPR to see if it holds vacuum. Only need to put 5lbs or so on it. No need for overkill or else it will go bad. The diaphrams inside them sometimes break and can no long work properly. And on a side note, Ive released the pressure in the rail, at the valve, and its never been a blast of gas. Just kinda trickles out. But then again that was with it off so not a steady pressure on it. Quote Link to comment Share on other sites More sharing options...
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