Low fuel pressure will always be due to some other problem in the fuel system, primarily a problem with the fuel pump. With the fuel filter, often it can get clogged from crap in fuel and when they start to clog they restrict the flow of fuel that will cause your pressure read outs to bounce and drop. The efficiency of the fuel filter decreases as it clogs; in fact, when a fuel filter is only 80% plugged, pressure drops are up to 20psi and the engine begins to be negatively impacted.
The other potential problem is in the pump itself. In the case of a wearing pump, readings may vary; e.g. in some models you come with them to approx. 40-60 psi all around (imagine). Drivers often complain of erratic pressure, which can fluctuate 10 to 15 psi under operation when they are having trouble with the pump. Sarah Lee — an automotive expert — said, “Having your fuel system periodically inspected can help prevent most pressure-related problems.
Q: What would make my fuel pump pressure to go up and down? an example can be electrical failures like a bad wiring or some kind of defective pressure regulator. A failed regulator can potentially allow too high of pressure to pass, which will damage the engine or additional components. The Automotive Service Association, for instance, reported that 30% of fuel system problems result from an electrical failure.
The quality of fuel is another high priority. Once the fuel comes in contact with deposits or pathogens in the system, such as algae, a biofilm begins to form and will continue to grow on wet surfaces. Fuel quality problems are experienced by as many as 15% of consumers, which costs them additional repair twice to three times a year: the average cost varies between $200 and $500 per repair depending on fuel contamination severity.
The average fuel pump life is 60,000 to 100,000 miles when a well-maintained vehicle. But if you neglect its maintenance, this lifespan can be greatly shortened. Hence, you must make sure that the fuel is clean and also inspect the fuel system components regularly to maintain adequate fuel pump pressure.
Further details on how to take care of the fuel systems have been shared over at the Fuel Pump.