I would guess some cars use other additional sensors to guarantee the electric fuel pump will be shut off, given vehicle roll over fuel leakage standards and todays liability environment.įollowing that same line of thought, the Toyota Prius similarly opens a relay located inside the high voltage battery enclosure for automatic shut off HV power in a major accident, that must be reset through a special procedure. Airbags firing on new cars also drop the fuel pump relay. If just 800kg or less expect a fuel master caution on takeoff or climb, this is expected and should be ignored. If more than 450kg on the ground, center pumps should be on. Toyota ECUs I'm familar with, shut down the fuel pump upon detection of six successive misfires, assumption being there's a big time problem up front or, accident has occurred. NGs now have auto-shutoff fuel pumps and nitrogen inerting for the center tank so, effectively, the risk of dry pumps has been removed. Of course the "freebie" feature by using the oil pressure switch as mentioned in the original post, is also to kill the engine if no oil pressure for whatever reason. nor manufacturers.Īs already noted above the oil pressure switch is a simple way of killing the pump in an ignition on, after accident scenario, the assumption being the engine will be stopped due to damage in the accident. Which leads to a severe fuel spill in short order in an accident that ruptures the fuel line any where, not good for possible unconscious passengers in the vehicle. GM and many others uses the oil pressure switch. Just cut a 1/2' diameter hole in the fuel bottle top and fit the hexagonal body with the seal and hex nut provided. Why don’t other car makers use an inertial fuel pump cutoff switch Other car makers use different safety strategies to shut off the fuel pump. Suitable for both petrol and glow engine fuel. Good luck with sorting it out, but be prepared to replace the fuel pump if the filter does not help your situation. to empty or fill your fuel tank with both in-built filtering, fuel tube end fitting, bottle vent and a stowage point. the entire line from the tank to the injector rail pressure regulator is at high pressure. If you pressure drops to 0, then you either have a bad fuel pump, a bad pressure regulator valve (inside fuel filter), a fuel leak between the pump and the engine, or a leaking injector (s). For the power for the switch that you now have coming from the starter, it should be coming from the purple wire, that way the power to the oil pressure switch gets shutoff when the switch is. You have the NO and NC on your drawing reversed, along with the 85 and 86 terminals on the fuel pump relay. 50psi is a typical fuel supply requirement on an injected system, and with the use of an electric fuel pump commonly located in the gas tank. Re: Oil pressure Switch Wiring For Fuel Pump. On fuel injected vehicles, the reason for automatic fuel pump shutdown would be the inherent danger in the rupture of a high pressure fuel line in an accident. Surprised that this factor has not been brought up with regard to the use of the oil pressure switch and other means, to kill an electric fuel pump.
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