electronic fuel pump

[inka]

anybody got a pic of wiring for a universal elect. fuel pump.
bought one and no instructions
only thing is how can i wire it so it cuts off for safety regs....
i mean motor on pump on, motor stops pump turns off.
any help would be great

[Bartso]

what do you mean when motor stops pump stops what siuation are we talking about


i mean when starting the engine the pump pumps before the engine is started

only thing i can think of is a isolator for the whole thing flick the switch and everythings dies

usually there is two terminals a positive and a negative (one power and one ground)

[-Scott-]

You'd need some kind of electronic circuit:

part a: being a timer to run the pump for 5-10 seconds while you start
part b: a circuit to keep it running while the engine is still running.

For part b, maybe a circuit watching the coil negative, to ensure it keeps pulsing. Once it stops pulsing, the engine is stopped, so kill the fuel pump.

Where to get one? NFI. I could build one, but never got a round tuit when I needed one. Car was killed, so I don't need it any more.

Good luck,

Scott

[DAZZ]

I have done a few engine conversions in the past and have used a LPG safety switch to control an electric fuel pump. This is used to switch a relay to supply the pump. It will operate like a LPG system as in it will allow the pump to prime for a few seconds when the key is turned on and will switch off until it receives a neg pulse signal from the coil to keep the system operating.
Hope this will help.

[-Scott-]

Sounds like the go!

[inka]

have heard of wiring through the oil press switch so it runs from ignition on(key) then if oil press off ie. rollover and motor stops
what do you think

[chimpboy]

http://www.gore-research.com.au/GastecS ... tSD40.html

"The SD40 Gas Safety Switch is suitable for operating both LPG (Propane and Butane) and CNG (natural gas or Methane) valves. The function of the Safety Switch is to close the gas valves should the engine stop. This may occur if the vehicle is involved in an accident, or if the driver inadvertently leaves the ignition turned on.

The SD40 has a built in "primer" that opens the gas valves when the ignition is first turned on for a period of 2.5 seconds. This allows positive pressure convertors (vapourisors) to fill the gas vapour line before starting. This ensures easier starting of the vehicle, particularly in colder weather, or when the vehicle has been left overnight.

Unlike many other safety switches available on the market, the SD40 is rated at a full 10 amps. This is very important when multiple gas valves are installed. The SD40 exhibits no voltage drop across its output. Gastec Corporation and our affiliates have produced over 220,000 safety switches since 1988.

The SD40 is water-resistant and is designed for under-bonnet installation.

The SD40 has a UL approval."



Just found this in a quick search. No idea what it'd cost, probably not much.

They also have a few other cool things, like an automatic enrichment thing for starting EFI/LPG vehicles etc... hmm.

Jason