SO-MO Speed Shop Hilborn catolog and technical support

Hilborn Technical Support - Mechanical Systems - General Installation
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Operating Tips

These operating tips and suggestions are the result of experience gained by years of running under varied conditions.

• Due to the extreme clean-burning of finely atomized fuel, spark plugs generally take a long time to show any color. Do not change the mixture because of plug readings based only on a few laps. Pay more attention to the indications on the tops of the pistons, if visible, than to the plugs.

• If the system does not operate correctly, disconnect the nozzle hoses, remove nozzle caps and blow through the nozzles with air pressure. If this procedure does not solve the problem, we recommend sending the injector, fuel pump and by-pass valve to our factory for testing and/or repair. When returning the unit, please supply all pertinent information such as the cubic inch of the engine, the type of fuel being used (gas, alcohol, or percentage of nitro) and manifold pressure if supercharged.

• Do not allow running low levels of fuel in the tank as it will wash away from the pickup in the tank when the car is in the turns. The resulting gulp of air sucked into the system will give a momentary misfire in the engine. This is the first warning when running low on fuel.

• Avoid tampering with the adjustments continuously. The unit is factory set and ready to run as received. Simply install the injector, select the desired starting by-pass jet and go out and race.

• Shut the fuel off when the engine is not running to keep the nozzles from dripping. A shut-off valve should be installed on the outlet side of the fuel pump.

• When the car has been left standing with the engine hot, you may notice that the throttle has become a little tight. This is due to expansion of the aluminum casting as it picks up heat from the engine. When the engine is started, the fuel spray cools it down and the throttle will free up immediately.

• Extreme care should be taken to keep dirt from getting past the fuel filter and plugging a nozzle. Whenever the fuel lines are disconnected, tape up the openings immediately. Also watch for dirt in the threads of fittings when installing the pump and filter. Too much emphasis cannot be placed on the need for cleanliness.