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Hi. Thanks for using JA! I am Scott and I will try and help you out.
Does the check engine light come on?
Did the engine lose power recently?
THIS TRUCK WAS PARKED FOR ABOUT A YEAR, AND WAS FINE PRIOR TO THAT. NO CHECK ENGINE LIGHTS AT ALL, THE TRUCK IDLES AND RUNS GREAT BESIDES NO POWER ESPECIALLY WHEN LOADED (26' BOX).
Thanks for the information. If you have no check engine light then I would start with the fuel system. If the truck has set a year, I may check/change the fuel as well as the fuel filters.
If that does not do, I would check the fuel system pressure. I will look up and attach the procedure.
Here is the procedure for checking fuel pressure.
FUEL PRESSURE FULL LOAD
FROM FORM EGED-150
8. FUEL PRESSURE FULL LOAD
Measure fuel pressure at fuel filter bleeder
Measure pressure at full load rated speed
0-160 PSI Gauge
20 PSI minimum
? If pressure is low, replace fuel filter, clean fuel strainer and retest
? If pressure still low, perform Test 2B
NOTE: TESTS 8.9 & 10 MAY BE PERFORMED SIMULTANEOUSLY AT FULL LOAD CONDITIONS
To determine if the fuel system is supplying the engine with the proper fuel quantity and pressure at full load conditions.
NOTE: If fuel filter is equipped with a water-in-fuel probe, check with vehicle operator to determine if the water-in-fuel lamp has been illuminated during vehicle operation.
1. If pressure gauge was not connected to fuel system in Test 2, remove air bleed valve Figure 2.35 on fuel filter header. Install 1/8 inch (3 mm) pipe fitting in place of the bleed valve..
2. Connect a line from the fitting to the 0-160 PSI gauge of the Model D-200 Pressure Test Kit (ZTSE-2239) or Gauge Bar (PS94-831-3) Figures 2.36 & 2.37 . Start engine and run at low idle to check for fuel leaks in line to pressure gauge.
NOTE: Bleed air from the fuel line to insure an accurate reading.
3. Drive vehicle on road till engine reaches operating temperature. Find an open section of road and select a suitable gear. Depress the accelerator pedal (full depression) to the floor and accelerate to rated speed and 100% load.
NOTE: Driving the vehicle up hill or fully loaded will facilitate efforts of reaching the proper engine loading at rated engine speed.
4. Measure fuel pressure and record on diagnostic form. If pressure is not within specifications, replace fuel filter, clean fuel strainer and re-check fuel pressure.
NOTE: It may take a number of crank cycles to purge the air out of the fuel system after replacing the fuel filter.
If fuel pressure remains low after replacing the filter, perform Transfer Pump Restriction Test 2B.
there's no difference in the power by replacing and checking fuel fiter and strainer, the fuel pressure is at 23.4 and never goes below that. Do you believe this problem has something to do with the Turbo? The truck runs great and moves somewhat without a load.