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Primelock remote fuel filter installation
12 Valve PrimeLock Fuel Filter Adapter
1994-1996 Remote fuel filter mount installation
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PrimeLock Manufacturer:
Ashland Technologies, Inc.
32 Lehigh St.,
Ashland, PA 17921

OEM filter location Here is the problem - the OEM fuel filter location is way down under hoses, brake lines, and wiring. After years of grumbling every time I had to change the filter, I bought a PrimeLock remote filter mount at the 1997 TDR Rally auction. The remote filter mount is a back saver for me!
PrimeLock kit contents Easy fuel filter access! The PrimeLock kit moves the filter to the top of the engine for easy servicing. The remote filter head incorporates a check valve to keep the fuel system primed by preventing air from entering the fuel system when the filter is removed.

1994-1996 trucks use kit number PL9496, (NOTE: 1996 CA trucks equipped with EGR need kit number PL96E)

Tools needed:

Installation procedure: (=under construction)

Remove the fuel filter from the engine =Loosen the boost hose clamp at the intake air horn (7/16" wrench)
Remove the fuel filter from the engine =Remove the Air Horn from the intake manifold (10mm wrench)
Remove the fuel filter from the engine Remove the fuel filter with a strap wrench. See Fuel Filter Change for filter removal tips.
Adapter in vise for hose installation A filter adapter installs onto the engine's filter head and redirects the fuel to the remote filter through hoses. It is much easier to attach the fuel hoses to the adapter before the adapter is installed on the engine. Clamp the adapter in a vise and install the hoses, using a good pipe joint compound to seal the threads.
Adapter with hoses attached The filter adapter head is now ready to be screwed onto the OEM filter mount. Leave the protective plastic covers on the hose ends to keep dirt out of the fuel lines and tape the hoses together to keep them from flopping around while you attach the adapter to the engine. Mark the inlet or outlet hose (your choice) so that you can tell which hose goes to the filter head inlet and outlet.
Adapter with hoses attached Make sure the old fuel filter's rubber washer is not on the filter mount stud. Install the washer provided in the primelock kit onto the stud. Install the o-ring in the adapter head groove. Screw the adapter onto the engine in place of the fuel filter (keep the lines from twisting and binding as the adapter is attached). Make sure the adapter is tight.
  =Place the air horn back into position on the intake manifold to keep dirt from falling into the manifold while you work. If the gasket is damaged, replace it with Cummins PN 3913352. Attach the boost hose tighten the clamp to 71 in-lb.
L-bracket attached to the filter mounting plate =Attach the L-Bracket to the the underside of the filter mounting plate. (7/16" wrench, 1/8" allen wrench)
  =Install the flare fittings into the remote head - use a good pipe joint compound to seal the threads. (9/16" flare nut or open end wrench)
  =Attach the remote filter head to the mounting plate. (1/2" wrench)
L-bracket attached to the filter mounting plate =Connect the hose flare fittings to the adapter head. Make sure that the inlet and outlet are connected properly! (9/16" flare nut or open end wrench)
  =Position the adapter assembly onto the intake horn. Place the the spacer under the corner of the adapter mounting plate. Put a dab of thread sealer on the intake horn bolt ends and install the bolts. Torque the bolts to 18 ft-lb.
Use the wire and crimp splice sleeves to lengthen the WIF sensor pigtail Cut the WIF sensor wires and lengthen them using the wire and crimp splices provided in the PrimeLock kit.
  =Install the WIF sensor in the new fuel filter. Install the filter washer on the mount stud. Fill the filter with clean fuel and and screw the filter onto the mount.
  =Plug the WIF sensor into the wiring harness and install the plastic wire protector over the WIF wires. Push the fuel pump plunger about 100 times to purge air from the fuel system. Start the engine and check for leaks. If the engine stalls or does not fire, you may need to loosen the fuel line fitting at the injector pump and push the fuel pump plunger to bleed air from the system. Filter changes will be much easier now!

CAUTION: I reinstalled the original WIF drain tube, but it would occasionally catch on fender hardware and open the drain valve as the engine moved around. After leaving a nine mile trail of fuel on the road when the tube got caught on a heater grid relay one morning, I removed the tube!

Optional Fuel Filter Restriction gauge

Tools needed

Restriction gauge parts Then optional pressure differential gauge gauge kit provides a quick way to check the condition of the fuel filter. The line where green and red meet indicates a "clogged" or dirty filter. Installation of the gauge onto the filter head is a two minute job.
Remove these tow restriction gauge port plugs Use a 7/16" wrench to remove the two filter port plugs in the filter head.
Remove these tow restriction gauge port plugs Install the two supplied 0-rings into the port recesses in the back of the gauge.
Gauge installed Use the two hex head machine screws and lock washers to attach the restriction gauge to the filter head.



Last Update: February 13, 2002