Poor Engine Performance

1. Ensure an adequate supply of fuel is available, and replenish as necessary. If fuel supply is sufficient, proceed to step 2.
2. Check for fuel, oil and/or coolant leaks and restrictions in air cleaner, and replace or repair components as needed. If no leaks are evident and air cleaner is not restricted, proceed to step 3.
3. Inspect exhaust system for dents or other damage which could cause restrictions, and repair or replace components as necessary. If exhaust system is not restricted, proceed to step 4.
4. Disconnect fuel inlet line from injection pump and insert into a suitable container. Operate primer pump on top of fuel filter cover. If fuel flows freely from line, proceed to step 5. If there is no fuel flow, replace filter. If problem still exists, fuel tank(s) and/or fuel line(s) are faulty.
5. Examine fuel for contamination. If fuel is not contaminated, proceed to step 6. If there are contaminants in fuel, clean and/or repair fuel system components as necessary.
6. Disconnect and drain fuel line(s) from injection pump inlet and fuel tank(s). Plug tank end of line(s) and pressurize to 20---25 psi, then apply a soap and water solution to all connections. If there are no bubbles, reconnect inlet line, bleed fuel system and proceed to step 7. If any bubbles are observed, repair leaking connection(s) and repeat leak test.
7. Ensure throttle lever contacts stop with accelerator pedal fully depressed. If lever contacts stop, proceed to step 8. If lever does not contact stop, adjust or replace throttle linkage as necessary.
8. Check engine idle speed with engine at normal operating temperature, transmission in Neutral and parking brake applied. Idle speed should be 780---830 RPM. If idle speed is within specifications, proceed to step 9, otherwise adjust as necessary.
9. Check ignition pump timing as described under ``Injection Pump Timing,'' and adjust as necessary. If pump is properly timed, proceed to step 10.
10. Check fuel injection nozzles for damage and ensure proper operation. If nozzles are satisfactory, proceed to step 11. If damaged or malfunctioning, clean, repair or replace as necessary.
11. Perform engine compression test. If compression is satisfactory, replace injection pump. If compression is low, inspect engine components to determine cause and repair or replace as necessary.