FDS16 - Check Pressure Difference

^ Key Off.

^ Observe Service Precautions to avoid fuel spillage and injury.

^ Install fuel pressure test kit.

^ Install a second fuel pressure tester between fuel pump and the in-line fuel filter, as close to the pump as possible.

^ Disconnect and plug vacuum hose from fuel pressure regulator.

^ Start engine and observe fuel pressure difference between gauges.

^ Key Off, compare gauge readings within 10 seconds. Both should read the same, or else one gauge is in error.

^ Is fuel pressure difference between gauges less than 10 psi?

YES -- Replace fuel pump assembly. Inspect inside of tank for interference, contamination of fuel. Service as necessary. Replace fuel filter. Fill tank with fresh fuel.

NO -- Replace fuel filter and check system. Repeat Test Step FDS2 for verification. FDS2 - Fuel Pressure Test