Pump adjustment procedure – Banks Power Chevy_GMC Trucks: Diesel ’93 - 96 6.5L Power Systems- Stinger System '93-early '94 (non-cat) & '94-up ( w_ cat) Pickups & Suburbans w_ factory turbo option User Manual

Page 12

PUMP AdJUstMeNt ProcedUre

NOTE: This section applies to 1993 and early 1994

model year vehicles only.
NOTE: The engine must be COLD before starting this

procedure.
NOTE: Utmost cleanliness should be exercised. Do

NOT use any rags during the adjustment procedure.

The lint from the rag can clog an injector. Lay all

parts on clean newspaper during the adjustment

procedure.
Make sure both battery ground cables are disconnected.

disconnect the wiring from the top of the fuel injection

pump cover. note their location for reassembly.
place a drip pan under the rear of the engine to catch

fuel. clean the upper portion of the pump with diesel

fuel or a parts cleaning solvent. See Figures

and

Do NOT clean the pump while the engine is hot, as

doing so may damage the pump.
remove the fuel return line from the pump cover.

remove the top attaching bolt and loosen the lower

attaching bolts on the fast idle solenoid and place the

solenoid aside. remove the pump cover bolts and

remove the cover.
IMPORTANT: utmost care must be used to prevent

damage.

using a syringe or similar means, remove as much

diesel fuel as possible from the injector pump housing.

This will make it easier to view the allen-head

adjustment screw through the slot in the bottom of the

pump housing when it is rotated into position.
rotate the engine slowly by hand, in a clOckWise

direcTiOn OnlY, using a breaker bar, a short extension

and a

” socket on the vibration damper bolt to bring

the allen screw into view in the inspection slot in the

bottom of the pump bowl (see Figure

). it may be

necessary to remove the front crankshaft pulley to gain

access to the vibration damper bolt to turn the engine

over. do Not AtteMPt to rotAte the eNGiNe with

THe sTarTer. The allen head screw may be hard to

see – a flashlight or shop light may help. The screw will

have to be adjusted at an angle from under the guide

stud/spring assembly.
Using a

” ball-end style allen wrench, rotate the allen

screw as indicated earlier. clockwise increases fuel,

counterclockwise decreases fuel.
NOTE: The Allen-screw turns fairly tightly, and is

self-locking. Turning the screw clockwise adds fuel.

Keep track of your adjustments.
inspect the pump cover to make sure the seal is seated

in the cover. replace if questionable. fill the pump

figure 8

p.n. 96309 v.3.0