I used an inertia switch from a Ford Tempo. Easy to find at a wrecking
yard, wire in series with the fuel pump, mount with two small holes in an
upright position. Cost me all of $10 from pick-n-pull.
At 12:05 AM 6/21/2003 -0400, Mark Sedlack wrote:
>Here's how I go about adding a safety oil pressure switch so the pump only
>runs when the ignition is on and the oil pressure is up. Use an oil
>pressure switch from a Chev Vega. You will also need an 1/8" brass tee and
>maybe some short pipe nipples, etc. to plumb both the switch and the guage
>or guage sender. These switches are available from most local auto parts
>stores. Three part numbers: NAPA (Echlin brand) p/n ECHOP-6610 or Standard
>brand p/n PS-133 or Delco PS-9. While at the parts store, also get a
>standard sealed-beam headlight 3-prong socket connector. This connector fits
>the new oil pressure safety switch. The switch is about $9 and is cheap
>insurance.
>
>The switch has three prongs marked "I", "S" and "P." When there is NO oil
>pressure, the "S" and "P" are connected. When there is oil pressure, the "I"
>and "P" are connected.
>
>The "I" wire is connected so it receives 12 volts, fused, when ignition
>switch is on.
>The "P" wire goes up to the pump or pump relay depending on the pumps
>current draw.
>The "S" wire goes to the starter solenoid "S" terminal to energize the pump
>during cranking.
>The negative terminal of the pump is grounded.
>
>How does it work?
>
>The "S" wire runs from the pick-up terminal of the starter solenoid which is
>energized only when the key is turned to start the motor. The current goes
>through the normally closed (at rest) contacts of the oil pressure switch to
>the fuel pump (between contact "S" and contact "P"). When the engine starts
>and the oil pressure rises, the switch transfers, causing current flow from
>the ignition switch (contact "I") through the transferred switch contacts to
>the fuel pump (contact "P"). As long as oil pressure is maintained and the
>ignition is on, the pump keeps running. If oil pressure is lost from an oil
>pump failure, or a major short develops, the engine automatically shuts
>down.
>
>Mark Sedlack
>Cuyahoga Falls OH
>66 1600 http://home.neo.rr.com/mark2000/images/datsun1600/
>77 280Z http://home.neo.rr.com/mark2000/images/datsun1600/Z.htm
>
Adam Bradley
'70 Datsun 1600 Roadster SPL311-28181
'66 Datsun PL411 sedan PL411-022447
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