Fuel Service Diagnosis - Jeepster
Symptoms of fuel issues and probable remedies
Looking for fuel parts for your vintage Willys or Jeep? Search fuel by Category or by Diagram.
Excessive Fuel Consumption
Possible Solution
Tires improperly inflated
Inflate
Brakes drag
Adjust
Engine operates too cold
Check thermostat
Heat control valve inoperative
Check thermostatic spring
Leak in fuel line
Check all connections
Carburetor float level high
See "Carburetor" section
Accelerator pump not properly adjusted
Adjust
Leaky fuel pump diaphragm
Replace
Loose engine mountings causing high carburetor fuel level
Tighten
Ignition timing slow or spark advance stuck
See "Distributor" section
Low compression
Check valve tappet clearance
Air cleaner dirty
Remove and clean
Engine Hesitates on Acceleration
Possible Solution
Accelerator pump does not function properly
Replace piston and rod, or adjust
Carburetor float level
Adjust
Spark plugs
Replace, or clean and adjust
Low compression
Check valves
Distributor points dirty or pitted
Replace
Weak condenser or coil
Replace
Carburetor jets restricted
Remove and clean
Excessive engine heat
See "Engine" section
Engine Stalls / Won't Idle
Possible Solution
Improper condition of carburetor
See "Carburetor" section
Low speed jet restricted
Remove and clean
Dirty fuel sediment bowl screen
Remove and clean
Air cleaner dirty
Remove and clean
Leaky manifold or gasket
Replace
Fuel pump diaphragm porous
Replace
Loose carburetor
Tighten flange nuts
Water in fuel
Drain and clean system
Improper ignition
See "Distributor" section
Spark plugs
Clean and adjust
Valves sticking
Grind valves
Learn more about fuel from the Service Manual for Universal Jeep Vehicles, page 110.
