ALTERNATE 11 FUEL CORRECTION PROCEDURES. (cont)

TM 9-2815-210-34-2-1

b . Run the engine at low idle speed (5 minutes minimum for fuel mixing) until

w a t e r temperature reaches 120F. H i g h e r water temperatures are acceptable. How-

e v e r , the misfiring described below may go away as the engine reaches operating

temperature.

c . W i t h engine at idle speed and transmission in neutral, attempt to accelerate to

r a t e d e n g i n e s p e e d . R a t e d engine speed is 2,600 rpm for all models except

L D S - 4 6 5 - 2 (M656 Series Trucks), which is 2,800 rpm. S m o o t h , rapid acceleration to

r a t e d speed without misfire shows that fuel is good as is. If this condition is not

m e t , addition of diesel fuel is required (up to 30 percent diesel fuel may be

necessary).

NOTE

M i s f i r e at higher than rated engine speed is good

w h i l e performing the above test.

d . Other reasons for the addition of diesel fuel that may happen during normal

operation are:

( 1 ) Not being able to accelerate a warm ( 120F. minimum water temperature)

e n g i n e under light loads.

( 2 ) Popping in the exhaust system when accelerating after going down a

long down grade.

( 3 ) Popping in the exhaust system when shifting transmission.

NOTE

Vehicles wit h two tank fuel systems:

I f unknown, or low octane fuel is added to both

t a n k s , the secondary tank must have the same

a m o u n t of diesel fuel added to the primary tank

p l u s an additional 10 gallons of diesel fuel.

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