What to Do When p0087 Fuel Rail System Pressure Is Too Low?
4 Answers
p0087 fuel rail system pressure is too low. First, check the gasoline filter to see if it is clogged. If it shows low fuel rail pressure, you should first inspect the high-pressure fuel pump and then the low-pressure fuel pump in the fuel tank. Both of these situations require replacing the corresponding components. More information about automotive faults is as follows: 1. Definition of automotive faults: Automotive faults refer to the phenomenon where a vehicle cannot perform its functions, such as difficulty starting the engine, failure to start, oil or water leakage, malfunctioning lighting systems, etc. 2. Manifestations of automotive faults: If there is a fault, there will be manifestations. Common fault manifestations include sudden changes in working conditions, abnormal sounds, unusual odors, abnormal exhaust smoke, abnormal temperatures, abnormal appearance, abnormal fuel and lubricant consumption, and leakage. Common faults are those that occur frequently and are often encountered during use.
As someone who frequently tinkers with cars, I've encountered this issue several times. The P0087 fault code usually indicates insufficient fuel pressure, which can be particularly dangerous if the car suddenly stalls on the highway. I would first check if the fuel pump fuse is blown. If you can't hear the fuel pump humming when touching the fuel line, there's an 80% chance the fuel pump has failed. If the fuel filter hasn't been replaced in two years, it might be clogged and unable to supply enough fuel. Last time, my friend's car was fixed immediately after replacing the fuel filter. Another less common scenario is a stuck pressure relief valve. The most reliable method is to use a diagnostic tool to read real-time fuel pressure data—if it's below 300 kPa, there's definitely a problem. Remember, never continue driving forcefully; calling a tow truck is the safest option.
A veteran mechanic with 20 years of experience shares insights. Insufficient fuel pressure not only triggers the malfunction indicator light but also causes surging during acceleration. Common issues fall into three categories: low-pressure fuel system problems like clogged fuel pump screens in the tank or burnt fuel pump connectors; high-pressure system issues such as leaking injectors or drifting rail pressure sensor readings; and often overlooked stuck return line pressure relief valves. Last month, I fixed a Tiguan where mice had chewed through the return line. During diagnosis, prioritize checking fuel pump voltage—you can access the fuel pump cover by removing the rear seat. Spraying electrical connectors with carb cleaner might yield surprising results.
I was also confused when I first encountered this fault code, but later an experienced auto repair master taught me a few tricks. The top priority is to turn the car key to the ON position without starting the engine, repeating this four or five times to build up pressure in the fuel line. If you can hear the fuel pump briefly working each time, the fuel pump issue is basically ruled out. Then, open the engine hood and pinch the return fuel line to feel the pressure fluctuations. Many cars now use a returnless fuel system, so focus on checking the fuel pressure regulator with a filter screen. Remember, the 2012 Focus had a common issue with clogged regulator filter screens—just spend eighty bucks to replace it with an aftermarket part.
