![]() ![]() The reason your 3.1L or 3.4L GM vehicle is not starting is due to another reason. This fuel pressure gauge result lets you know that the fuel pump is working and delivering enough fuel to the fuel injectors. If the 12 Volts are being supplied to the fuel pump, then you have now 100% verified that the fuel pump is fried and needs to be replaced.ĬASE 2: If the fuel pressure gauge registered 35 PSI. What you'll have to do to accomplish this is to attach a multimeter in Volts DC mode to the wire that supplies this voltage to the fuel pump and while a helper cranks the engine, verify that the fuel pump is getting this power. This is just to make sure that the fuel pump relay and fuse are OK and doing their job. Now, I usually take one more precaution, before condemning the fuel pump as bad and this is to check that the fuel pump is getting 12 Volts as the engine is cranking. This confirms that the cause of your Venture's (Malibu, Impala, Lumina, Grand Am, Cutlass Supreme, etc.) is caused by a lack of fuel. OK, now that the testing part is done, let's take a look at what your results mean:ĬASE 1: If the fuel pressure gauge registered 0 PSI. Your fuel pressure gauge will register one of the two following results:ġ.) The fuel pressure gauge will register 35 PSI.Ģ.) The fuel pressure gauge will register 0 PSI. Whichever one you buy, it's an investment that will pay for itself many times over. The price difference depends on what type of fuel pressure gauge set you buy, this means either buying a non-professional technician grade tool or a professional technician grade too. All vehicles now use an electrical fuel pump to deliver fuel (under high pressure) to the fuel injectors and the best way to diagnose this fuel pump is with a fuel pressure gauge.Īs mentioned earlier (in fuel pump test 2), in all of the GM 3.1L and 3.4L V6 equipped vehicles GM was kind enough to put a Schrader valve on the fuel injector rail where you can tap into the fuel system and check its performance.Ī fuel pressure gauge can cost you as little as $40 (US) or as much as $200 (US). Owning a fuel pressure gauge is now becoming a must. Which And Where To Buy A Fuel Pressure Gauge You've sprayed starting fluid (or carburetor spray) into the throttle body and your vehicle started, even if only momentarily.Īlthough the above list is a not a very complete list of symptoms, the theme that runs thru' them, and any other related symptom, is that the engine will crank and crank, but not start. ![]() So you know that the ignition system is not at fault. All of the coil packs, sitting on top of the ignition control module, are creating and delivering spark to the spark plugs.Symptoms Of A Bad Fuel PumpĪ bad fuel pump will make your 3.1L or 3.4L Venture (or Malibu, Regal, Skylark, Corsica, Impala, Venture, etc.) crank but not start. You can find this tutorial in Spanish here: Cómo Probar La Bomba de Combustible (GM 3.1L, 3.4L) (at: ). Accomplishing both tests indicated in this article, without any unhappy consequences, is more than possible if you're careful and use common sense. Use extreme care when using starting fluid since it ignites as easily as gasoline. Be careful and take all necessary safety precautions. IMPORTANT: Gasoline is extremely flammable. Is The Anti-Theft System Causing The No-Start Condition?.FUEL PUMP TEST 2: Using Starting Fluid.FUEL PUMP TEST 1: Fuel Pressure Test With Gauge.Which And Where To Buy A Fuel Pressure Gauge. ![]()
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