Electric fuel pump cut off switch when the engine turns off...

[WAGON JON 146]

Lead me to the forum that talks about electronic fuel pump cut off when the engine turns off. I don't want to do the oil cut off switch. There's got to be another way?

[datzenmike 37,256]

Power it from the idle cut solenoid or the distributor. These are only on when the ignition is on. Likewise the heater or wiper fuse will work but the pump would be on in the accessory position.

[thisismatt 8,111]

EFI or carb?  Tell us a little more about your current setup...

Edited February 24, 2020 by thisismatt

[WAGON JON 146]

28 minutes ago, thisismatt said:

EFI or carb?  Tell us a little more about your current setup...

L series side drafts on one and VG30 EFI on the other. Both with electric pumps.

 

[WAGON JON 146]

46 minutes ago, datzenmike said:

Power it from the idle cut solenoid or the distributor. These are only on when the ignition is on. Likewise the heater or wiper fuse will work but the pump would be on in the accessory position.

Don't have an idle cut solenoid that I know of. What wire to the distributor?

[thisismatt 8,111]

And you want it to turn off in the key ON, engine OFF state?

[DanielC 3,169]

1972 521 trucks with an electric choke used a relay to turn on the choke heater.  the relay got a voltage from the the alternator, I think in the "N" terminal.  This system used an externally regulated alternator.

In order for the choke heater coil to get electricity, the ignition key had to be on, and the alternator had to be turning, making electricity.

 

I believe 510 sedans, and wagons used the same system, but in earlier years, because the cars got the electric choke before the pickups.

[datzenmike 37,256]

I thought about the choke relay but no electric pump until the engine is running. It would generally work... if there was gas in the carb and the engine started right away.

[thisismatt 8,111]

It doesn't seem like relying on your alternator working would be wise.  At least when your alt dies you can still drive a little while on battery, but not if you fuel pump shuts off with your dead alt...

[datzenmike 37,256]

Using the ground to control a relay would be good. As soon as you crank the engine the ground disappears on the sender and the pump comes on. When I crank my L20B the pressure reads 30, you only need about 8 to turn the light off. 

[rosso 278]

13 hours ago, DanielC said:

1972 521 trucks with an electric choke used a relay to turn on the choke heater.  the relay got a voltage from the the alternator, I think in the "N" terminal.  This system used an externally regulated alternator.

In order for the choke heater coil to get electricity, the ignition key had to be on, and the alternator had to be turning, making electricity.

 

I believe 510 sedans, and wagons used the same system, but in earlier years, because the cars got the electric choke before the pickups.

 

USA 510 had this '72-'73 only

[WAGON JON 146]

14 hours ago, thisismatt said:

And you want it to turn off in the key ON, engine OFF state?

Yeah.

 

[WAGON JON 146]

I know the ECU on the VG 30 would work except I can't get it to work. So it is hard wired to ignition on. Once in a while when the engine is cold the engine will turn off, die, and the fuel pump still goes. That is what I want to fix on the VG. The wires and ECU are from a 1991 Infinity M30.

[WAGON JON 146]

2 hours ago, datzenmike said:

Using the ground to control a relay would be good. As soon as you crank the engine the ground disappears on the sender and the pump comes on. When I crank my L20B the pressure reads 30, you only need about 8 to turn the light off. 

I like that idea. Now I need to figure how to wire that one.

 

Edited February 24, 2020 by WAGON JON

[BRG510 69]

https://www.revolutionelectronics.com/Products/Fuel_Pump.html

 

I have thought about trying this simple controller for my fuel pump. I like the prime feature. Works off similar concepts people were discussing here.

[WAGON JON 146]

10 hours ago, BRG510 said:

https://www.revolutionelectronics.com/Products/Fuel_Pump.html

 

I have thought about trying this simple controller for my fuel pump. I like the prime feature. Works off similar concepts people were discussing here.

That actually looks like it would work.

 

Funny how only Ca residents are warned they will get cancer!

"California Residents - WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov" 

Edited February 26, 2020 by WAGON JON