In an effort to make the 240z more reliable, I've decided to upgrade to an electric fuel pump and then retire the mechanical pump. By using quality parts and a smart plan, this will prevent vapor lock, keep the float bowls properly filled, and should allow for the car to start easier.
Parts List
- Fuel Pump (low pressure, 4.5PSI max, 30GPH): Airtex E8016S (~$38)
- Oil pressure switch: Airtex OS75 Safety Switch Oil Pressure (~$15)
- Mechanical fuel pump block-off plate (~$25)
- Brass "T" (1/8" FIP): Watts AC-704 (~$5)
- Brass male-male (1/8"MIP 1/8"MIP): Watts AC-714 (~$2)
- 30amp automotive relay: Dorman 84601 (~$5)
- inertia switch (optional)
- Wire, fuses, and miscellaneous connectors
- Fuel Hose
My first step was to plumb the engine block for an Oil Sensor Safety Switch. As you can see from the picture below, I inserted a "T" joint to allow me to keep the current oil pressure gauge (second picture) as well as the new safety switch.
Next I needed to design a reliable and safe wiring scheme which would incorporate the factory wiring for a fuel pump but also allow for the safety switch and relay. In the diagram below, the GRN wire and the BLK/WHT already exist in the wiring harnesses; the plug is just taped to another set of wires below the fuse box.
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| Wiring Diagram, designed and drawn by me |
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| The fuel wire harness is held with blue tape (see circle). The BLK/WHT wire is live with the ignition switch. The GRN wire goes back to the fuel pump (wired from the factory). |
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There are two unused harnesses. Left is the Fuel Pump, right is the Fog Lights
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| New electric fuel pump. I ended up using an existing bolt/nut for the mustache bar to mount the pump. |
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| Relay with the initial wiring |
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| Relay once the wires were bundled nicely |
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| Oil pressure sender initial wiring |
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| Oil pressure sender wires bundled nicely |
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| Mechanical fuel pump block-off plate |
