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SF Pressure Sensor/Fuel Pump Question

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Old Oct 15, 2004
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SF Pressure Sensor/Fuel Pump Question

Until I'm ready to up my boost beyond 4psi and hook up the alcohol injection wires, I was wondering is it safe to use the pressure sensor that I received with my alcohol injection upgrade to turn on the fuel pump at 0.5psi? Can it be adjusted to that low a setting? I'm also wondering if the allen screw will stop when it reaches 0, or will it continue on to sense vaccum?
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Old Oct 15, 2004
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It will not sense vaccum. But to turn it down to run the fuel pump, basically you keep backing it out until you hear it start to rattle when you shake it. That is a great starting point.
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Old Oct 15, 2004
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yeah, after burning up 3 pumps....i am gonna buy a another hobbs switch to run my pump

at $100 a pump, i can't afford to keep doing this
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Old Oct 16, 2004
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so when you shake the sensor it and it rattles thats the lowest point where the switch sees pressure??
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Old Oct 16, 2004
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Originally Posted by civic01vtec
yeah, after burning up 3 pumps....i am gonna buy a another hobbs switch to run my pump

at $100 a pump, i can't afford to keep doing this
How did you end up burning 3 pumps ???
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Old Oct 16, 2004
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Cuz, the pump is always running, no matter what, that one way of butning it, cuz theres no way of cooling it.......

Or bad wiring or ground.....
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Old Oct 16, 2004
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Originally Posted by CivicMexicano
Cuz, the pump is always running, no matter what, that one way of butning it, cuz theres no way of cooling it.......

Or bad wiring or ground.....

the last pump i installed had a toggle swtich so i can turn it off when not boosting and a 30 amp inline fuse installed. It lasted about 50 miles

I believe there is something wrong with my FMU........how come other ppl have no problems
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Old Oct 16, 2004
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yeah., i have no probs with fuel pump ever... hmmmmmm,,,,
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