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Installation instructions for Tork Tek HP Overflow-Valves

Installation Instructions for the Tork Tek HP Overflow Valves


The original overflow valve is located on the back side (facing the engine) of the P7100 injection pump. The pump is located in the top-forward area of the drivers side of engine. Look for 6 injection lines on top of the pump. The valve is hidden behind the upper radiator hose. A steel return tube and banjo fitting are attached to the overflow valve. The return tube is facing down.

Clean around the valve and banjo tube assembly with a clean shop towel and gently blow off any loose particles with compressed air. Be sure to wear safety glasses.

Using a 3/4” or 19MM wrench, loosen and remove the old valve from the injection pump. In order to remove valve, gently lift the banjo fitting and tube upwards and back, just enough to remove the valve. Make sure you remove the old banjo seal washer from the back side of fitting. Discard old seals.

Cardinal rule in hydraulics. Never install a seal dry. Coat the new BS14MM seals with hydraulic or engine oil. The oil helps to make a better seal and prevents the rubber coated seal from tearing. Install one seal on the valve. Hold one seal behind the HP valve as you screw the new valve into place. Torque to 24 ft. lbs. Do not over tighten as you can strip the threads in the injection pump.

For testing, run a 24” to 30” length of ¼” ID fuel rated hose from the fuel source to a gauge. You may have to locate adapters at a hydraulic supply company. This step is for testing purposes ONLY. It is not a permanent installation.

For permanent installations to an in-cab gauge, DO NOT run a hose directly to gauge. It is a fire hazard and is illegal in most racing organizations. Use one #4 SS braided fuel line to a fuel isolator (Tork Tek® PN R7797) and one hose to the gauge. To achieve accurate gauge readings, follow instructions carefully.

Key the ignition switch but do not start the engine. Let the electric pump run for 10 seconds to bleed out any air in the fuel system. Start the engine and check for fuel leaks.

Remove the test gauge and hose after checking the fuel pressure. Save instructions for future reference.

The Air Dog I is preset at 30 PSI. You may not see higher fuel pressure even though you installed a high performance valve. The valve was designed to increase fuel pressure at full throttle. If you need higher pressures, install a 40 PSI spring. Tork Teknology is not responsible for injection pump leakage or damage from running excessive fuel pressure or the use of a HP overflow valve.