Start Your New Pump in a Clean Environment
Replacing the fuel pump strainer is required, but it is not enough if the tank is dirty. Make sure to inspect and clean the fuel tank as well.
Clogged filters are a leading cause of premature pump failure, so replace the fuel filter if it is not internal to the assembly. Internal filters are not serviced separately.
A Pressure Test is Not Enough to Condemn the Pump
High fuel pressure can often be attributed to a fuel pressure regulator issue or a restriction in the return line. The engine may run rich or fuel trims may be elevated.
Low fuel pressure can be caused by insufficient power or ground to the fuel pump or a malfunctioning fuel pressure regulator. Contamination in the system can cause restrictions to the fuel feed lines, fuel strainer, or fuel filter.
No pressure can be due to a faulty relay, fuse, wire harness, or oil pressure switch, tripped inertia switch, or dried test fluid.
What to Check Prior to Repair
The pump may not necessarily be the cause of fuel-related driveability problems or failures. So make sure to:
1. Confirm there is fuel in the fuel tank
2. Check fuel pressure
3. Check flow
4. Check fuel filter and pressure regulator
5. Perform a voltage drop test
6. Check electrical connections
7. Clean tank and inspect for debris