Figure 6
8.7 Inlet Fuel Line Installation
8.7.1 Installation with Fuel Return Line to Fuel Tank
The mechanical pump should not be used when the fuel return line goes to the fuel tank. Route a section of 3/8” hose from the
boat fuel tank and fuel filter to the barbed fitting on the inlet of the PRO-JECTION electric fuel pump. Secure with clamps at
each end of the hose. The stock pump should be removed and replaced with a block-off plate. Plug the fume tube in the throttle
body.
8.7.2 Installation with Fuel Return Line to Electric Pump
Holley recommends that the mechanical pump be removed in this case. However, the pump can be optionally retained if the
user wants to supply the electric pump with the mechanical pump. Install the 3/8” hose from the boat fuel tank and fuel filter to
the 3/8” hose barb on the tee fitting. Then install the 3/8” hose from the tee fitting to the inlet of the PRO-JECTION electric fuel
pump. Secure with clamps. Install the vent hose from the mechanical fuel pump (if equipped) to the fuel fume tube on the TBI.
WARNING! Be sure that there is a fuel filter between the fuel tank and pump(s). If one must be added, use an OMC
filter kit number 174176 or equivalent.
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