Checking fuel pump manner requires its own singular steps and procedures.
Without the fuel pump, there would be no Gauze delivery to the engine for combustion. Fuel pumps, if mounted externally on the engine or inside the Gauze vat, perform the equivalent servicing of sending Sufficiently fuel at decent the fitting impact to the carburettor, or fuel injection inveigh. As well all the more or also dwarf coercion can creator problems, including fuel hunger or flooding, which causes Rugged sluggish, mid-range stumble or a no-start action. Let the engine slothful. Lift the hood. Remove the air cleaner lid by unscrewing the wing kernel whether your vehicle has the older carburettor architecture.
Touch to your owner's repair volume to actuate what all heart of fuel delivery course you hold in your vehicle. Some fuel pumps Testament be eternally mounted mechanical components, while other fuel pumps appropriateness electronic signals from the vehicle pc and mount inside the Gauze vehicle. Test your Gauze vehicle equivalent to be positive a low-fuel or no-fuel dispute does not exist. There should be no outmost leaks from the Gauze container column to the fuel intake action.
2. Apartment the vehicle in arena or impartial with the emergency brake establish. Thanks to the engine depends on combustion, Glimmer and fuel, diagnosing the fuel pump has a hardly any of its own procedures and transaction checks.
Instructions
1. Peep down the throat of the carburettor while you manually unfastened the throttle linkage, using a accelerated flicking progress. The sudden opening of the throttle Testament make a stream of Gauze that spurts into the carburettor throat. Evidence of a Powerful Gauze stream indicates commendable fuel delivery. If the engine cuts out, or the stream looks weak, the problem will be with insufficient fuel delivery from the pump.3. Remove the air cleaner lid or disconnect the cold air intake hose at the throttle body to diagnose a no-start condition. Hold a spray can of starting fluid over the intake passage and have an assistant turn the key to the "Start" position. Spray the starting fluid into the intake while the engine turns over. If the engine starts or attempts to fire, it will mean the fuel pump has malfunctioned.
4. Refer to your owner's repair manual for the location of the fuel pump relay for a no-start condition. It should be located in the main fuse-block panel in the engine compartment or at the left side of the steering wheel under a plastic kick panel. The relay looks like a small black box and will have multiple connectors on it. Swap it with another similar relay in the fuse block and check for engine start. If the engine starts, replace the fuel pump relay.
5. Lift the vehicle up with a floor jack and place two jacks stands under the frame near the rear wheels. For this no-start condition, you will check the electric fuel pump inside the gas tank for operation. Don an automotive stethoscope and slide under the gas tank. Place the probe of the stethoscope near the top of the gas tank and have your assistant turn the key to the "On" position. If you do not hear a hum or buzz through the stethoscope, it indicates negative fuel pump operation.
6. Connect a fuel pressure gauge that has a "T" fitting to the fuel intake line just ahead of the fuel injection rail, or at the carburetor intake line, if so equipped. Disconnect the line clamp with either a slot screwdriver or the correct size end wrench. Refer to your owner's repair manual for the correct pressure reading for "residual fuel pressure" in pounds per square inch. The key should be in the "Off" position. If you read below specifications for residual fuel pressure or no pressure at all, the problem will lie with the fuel pump, a clogged fuel line or an impacted fuel filter.
7. Hook up the fuel pressure gauge as you would for the fuel pressure residual test. If the engine idles, even roughly, note the pressure reading on the gauge. The PSI reading should not fall below the manufacturer's specifications for your make and model vehicle. If it shows a low reading, the problem can be attributed to the fuel pump, a clogged line or a clogged fuel filter.
