Advertisement Observing the fuel-pressure PID during a test drive can give technicians insights into the health of the pump. If the pressure drops suddenly when accelerating, it could be a sign the pump is failing. The pressure should not change much during differing engine loads and speeds. This is because the pump is responsible for providing the correct volume while the pressure remains the same. Fuel pressure for most vehicles should stay in a 5- to psi range.
But, techs should make sure to look at the service information for the specifications. Other data PIDs used to regulate the fuel pump include the engine position sensors. Additional data used to control the pump could be the engine load and fuel requirements. The goal of these sensors is to provide the correct amount of fuel pressure at the fuel injector so when the fuel injector opens, it shoots an accurate amount of fuel into the cylinder with a proper spray pattern.
Drivability symptoms of a weak fuel pump might be a loss of power. Some vehicles will record the fuel pressure as part of the freeze frame if a code is stored. This can help technicians track down an intermittent fuel-pump problem. Since the fuel-pump module needs information for various sensors, it usually communicates on a serial data bus. The key to investigating these problems is to communicate with different modules to see what data PIDs are present and which ones are missing.
Check The Part! Education: Selling Shocks And Struts. Magazine Current Issue Past Issues. If it is sooty, it could be a sign of, a bad fuel pressure regulator. If you find a plug in this condition, check the rest of them. A sooty spark plug could just mean, the engine is burning oil in that cylinder. If you end up replacing your fuel pressure regulator, you might also want to replace your plugs.
You can try simply cleaning them and putting them back. But, if your engine still runs poorly, get new ones. Speaking of poor engine performance; if you are idling the engine and it is not running smoothly; change your oil filter and check your pressure regulator to repair bad fuel pressure. Another sign that your engine is suffering the effects of a bad regulator; is if you have trouble starting the car. It will turn over a few times, before it actually starts. Having black smoke coming out of your tailpipe; is a sure sign there is something wrong with your regulator.
Replace it. The normal color of any smoke coming out of the exhaust should be white or gray; not black. So, if you see the latter, there is definitely something wrong. Check the oil dipstick and see if you smell fuel on it. Your car's fuel pump is used to supply gas to the engine's fuel injectors weather it be gasoline or diesel fuels. Depending on the fuel system design you can have one or more styles of pumps in various locations both mechanical and electric models.
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