Tandem Pump Pressure Test

Fig 1: FUEL PRESSURE TEST PORT

Courtesy of CHRYSLER LLC

Remove fuel pressure test port cap (2).

Fig 2: FUEL PRESSURE GAUGE
Courtesy of CHRYSLER LLC
Install fuel pressure adapter 9938 (1).
Connect a 13.8 bar (200 psi) fuel pressure gauge (2).
Start engine and run at 4, 000 RPM, monitor fuel pressure.
If the minimum specification of 10.5 bar (152 psi) is reached the tandem pump is OK.

Fig 3: FUEL PRESSURE GAUGE
Courtesy of CHRYSLER LLC
If the minimum specification was not obtained, clamp off the return line between the tandem pump and the fuel filter.
If the minimum specification is obtained, replace the unit injector O-rings.
Remove the fuel pressure gauge (2) and fuel pressure adapter 9938 (1).

Fig 4: FUEL PRESSURE TEST PORT
Courtesy of CHRYSLER LLC
Install fuel pressure test port cap (2).