Tuesday, May 24, 2011

More details for testing injector pump on ford diesel 7.3?

The description is for both 6.9 and 7.3.so which engine you have follow that details:-----

No serviceable filter in the IP. I'm presuming you have some injector lines cracked loose at the injectors and no fuel at all there.
With key on engine off remove the pink wire from the top of the IP and touch it back to it's terminal. You should hear an audible click. If not, check for battery power at that wire. If you have power, the ESO (electric shut off) solenoid is not functioning.
If you do hear a click, remove the return line from the top of the IP. You should have fuel there while cranking. If this is a 7.3 and no return fuel, you have a fuel supply problem. If it is a 6.9, remove the black return fitting from the top of the IP and examine the little check ball inside for debris. If it looks like coffee grounds, you need an IP rebuild. You can clean the debris and it may get you running temporarily but may quit again any time without warning.
For either engine if you have good fuel flow coming out of the injector pump and no smoke at the tailpipe, you probably have an IP problem.

On diesel 7.3 loss of voltage to glow plug controller:
Usually as these trucks get older, the wires from the starter relay to the glow plug controller build up resisitance--usually at the engine harness connector--and melt the terminal at the controller, the harness connector or one or both fuse links at the starter relay. The best repair I have found is to overlay a new circuit, by-passing the trouble area of the engine harness connector. You need a 6 foot long 6 gauge starter or ground cable (ring terminals at both ends) and 12 inches of 14 gauge fuse link wire and some 1/2" diameter heat shrink tubing. Cut the end off the two yellow wires at the glow plug controller and remove the double wire or single cable at the starter relay and tape back the ends. About 4 inches from one end of the 6 gauge cable, cut the cable and stip back the insulation approximatly 3/4". Cut the fuse link wire in half, strip all 4 ends. Double up the two fuse links side by side and solder them between the two pieces of cable. Insulate the solder splices with the heat shrink. Install the cable at the starter relay and glow plug controller, routing it along the original harness and secure with plastic wire ties or electricians tape.


Stall after starting (especially after hot-soak/cool-down) then hard start
Air intrusion into the fuel supply system. Usually, the source of the fuel leak can be determined by the time from when the engine starts to when it stalls. On 6.9 engines with a firewall-mounted water separator, the engine will start and run for upto a couple of minutes before any air which may be in the separator reaches the injection pump. The 6.9 water separator is prone to leaks, both fuel and air. The best cure for this is to replace the OEM seperator with an aftermarket one (much cheaper--$30-$60 vs. $180), or remove it and its hoses and connect the line from the tank to the one running to the lift pump. Since it's not recommended to operate a diesel engine without a water separator, replace the fuel filter with the 7.3 type filter/water separator assembly. You can either purchase the header and sedimate bowl from Ford or a wrecking yard and install a new 7.3 filter. Another option is the

Racor fuel filter/water separator kit. see fig below:---



The 7.3 filter/water separator see fig below:--


The 7.3 filter/water separator can develop fuel/air leaks at the fuel heater and restriced filter sensor or the filter drain (all three are servicable) and water in fuel sensor o-ring. The air bleed Schrader valve can leak on either filter.
The next common area for air leaks on both the 6.9 and 7.3 engines is at the injector return cap o-rings and hoses. This will cause the engine to stall after about 30 seconds of running if the air is able to travel into the fuel filter. On 6.9 engines the return line from the filter should be long enough to loop about four inches above the filter.
The 6.9 can be modified to have a check valve at the fuel filter return to prevent air from entering the filter. A 7.3 Econoline filter outlet fitting (E8TZ-9C402-A) can be installed in place of the original outlet fitting. An early 3/16" 7.3 filter return orifice with a "flapper" valve can be installed into the port ment for the E-van's restricted filter sensor.
On 7.3 engine the filter return orifice contains a check valve. This check valve is usually a rubber flap inside the fitting, and if this fails air is drawn into the filter as the fuel cools and contracts. This can be detected by removing the fitting and trying to blow through it from the hose barb end. If you are able to blow through it from this direction, it needs to be replaced. Seal the threads on the orifice with Loctite 515 Gasket Eliminator or PST. There are two different flapper valve orifices--3/16" and 1/4"--and the correct one needs to be used with the coresponding hose size or leaks may occur. Starting in 92 a 1/4" filter orifice was introduced without a flapper valve using a spring and plastic check ball. The spring-and-ball and flapper orifices are not interchangable; they have different headers. Also, the correct size return lines hose needs to be matched to the injector caps and the proper clamps used--not worm-gear, this will distort the hose; either OEM spring clamps or fuel injection system screw-and-band type. When replacing injector return o-rings on one injector, you should replace all on that cylinder head as they tend to leak after they have been disturbed. Use silicone dielectric grease to aid in reassembly and some times it helps to install a third o-ring between the return cap and injector line nut to keep the cap in place.
On the fuel supply lines at the filter inlet, filter outlet and injection pump inlet, there are seals which can allow air to enter the fuel system if they become deteriorated or dried out, even if there are no visible signs of fuel leakage. If there is a leak on the line between the filter and injection pump, the engine will seem to try to start, then become hard to start. Note that there are seals of the same type on the injection pump return line at the injection pump and at the return line collector fitting on the rear of the engine (some applications).
Less common areas for air leaks are the injection pump outlet check valve and the fuel lift pump, but both have been know to happen. Using clear hose on various sections of the fuel suppy and return systems can usually pinpoint the area of the air leak. Install the clear hose at the suspect areas, start the engine to purge any air, then allow to cool. Watch these hoses for large air bubbles or pockets when starting the engine to determine the origin of the air leak. Also allow the engine to come up to operating temperature to look for air leaks which may occur when the system is hot. These may migrate into the filter and cause a hard start concern.


Engine stalls at stops or when deprsessing clutch
Stalls returning to idle after snapping throttle open. Injection pump problem caused by poor quality or contaminated fuel. Check for presence of water in the fuel--removal of the injection pump governer cover may be necessary to find contamination, but is not advisable unless you have experience. Check idle speed setting and injection pump timing, as well as cold timing advance--timing should advance at least 2 degrees with 12 volts applied to the rear solenoid terminal. Adding Stanadyne's All Season Diesel Fuel Conditioner may cure this problem, but if it persists, or if there is no cold advance, replace the injection pump. Recommend that the Stanadyne All Season Fuel Conditioner be used periodically to prolong injection pump life.

Injection Pump replacement tips:

  • Make a reference mark on the pump and upper timing cover if the same pump is being reinstalled. When reinstalling the pump, realign the marks.
  • Inspect the fuel suppy line seals and replace them as necessary.
  • On E-vans, remove the RH seat for easier access. Also remove the fuel filter and housing as a unit for more room.
  • Remove the pump with the injector lines attached. On 7.3 engines there is a timing adapter on injector #1 (F-Series) or #4 (E-Van), hold this with a back-up wrench when removing that line.
  • Replace the injector return cap o-rings while the pump is off if needed.
  • On engines equipped with a turbocharger, remove the pump upper mounting stud to allow for more maneuvering room.
  • Remove and install the injection pump inlet fitting into the new pump; replace the o-ring if necesssary.
  • Seal the threads of the injector return line fitting with Loctite 515 Gasket Eliminator or PST.
  • Do not remove the injection pump outlet/check valve fitting and install it into the new pump.
  • On E-vans, adjust the FIPL sensor (E4OD trans) on the bench before installing the pump.
  • When installing the pump, use a phillips screwdriver or slim line-up punch to align the pump shaft with the gear. Start the gear screws into the pump shaft before installing the mounting nuts.
  • Start the injector line nuts onto the injectors before tightening the mounting nuts.
  • Don't mount the cold idle kicker solenoid until the pump timing has been set.
  • If the pump is being replaced, advance it counter clockwise as far as it will go then tighten the mounting nuts. This will make dynamic timing (while running) adjustments easier later. If dynamic timing is not available, set the pump to the center of its adjustment range, or line up any reference marks on the pump and timing cover.
  • If the twelve-point heads of pump shaft to gear bolts round off, they can be replaced with bolts from NAPA's u-joint hardware kit P/N 331-10.
  • Leave the injector lines loose until you're ready to start the engine.
  • When re-starting the engine, connect a battery charger to one battery and disable the glow plug system to prevent glow plug damage.
  • Connect a jumper wire from the positive battery terminal to the cold advance solenoid to help purge air from the pump. See fig below:--
  • Crank the engine over in 60 second intervals and tighten each injector line nut as fuel appears at each injector.
  • Recommend using a non-alcohol fuel conditioner to control water and algae and promote lubricity.

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