red side

Engine does not rev up

Engine Does Not Rev Up

Possible Cause


Possible Remedy

Improper fuel (gasoline) in tank


Drain tank, flush system, fill with proper fuel

Tank empty or tank vent blocked


Fill tank/bleed system, check tank vent

Air in the fuel system


Bleed fuel system, eliminate air leaks

Fuel filter blocked


Replace fuel filter

Fuel-supply lines blocked-resticted


Test all fuel supply lines - flush or replace

Paraffin deposit in fuel filter


Replace filter, use winter fuel

Pump-to-engine timing incorrect


Readjust timing

Overflow fitting interchanged with inlet fitting


Install fittings in their proper positions

Cold-start device malfunction


Check cold-start mechanism

Low or uneven engine compression


Repair as necessary

Fuel injection pump defective or cannot be adjusted


Remove pump and service


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