But all electronic injected cars, once the engine starts the pump
runs continuously. The safety switch like on all those cars, isn't a bad
idea:
http://www.holley.com/HiOctn/ProdLin.../12-801-1.html
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

HomeBrewer wrote:
>
> On my other cars I can hear the pump when the key is on, but if I don't
> start the car the pump quits after a few seconds, the jeep just keeps
> running.
>
> --
> _____________________
> HomeBrewer
> 76-81-85CJ7
> All in one Jeep

 

But all electronic injected cars, once the engine starts the pump
runs continuously. The safety switch like on all those cars, isn't a bad
idea:
http://www.holley.com/HiOctn/ProdLin.../12-801-1.html
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

HomeBrewer wrote:
>
> On my other cars I can hear the pump when the key is on, but if I don't
> start the car the pump quits after a few seconds, the jeep just keeps
> running.
>
> --
> _____________________
> HomeBrewer
> 76-81-85CJ7
> All in one Jeep

 

But all electronic injected cars, once the engine starts the pump
runs continuously. The safety switch like on all those cars, isn't a bad
idea:
http://www.holley.com/HiOctn/ProdLin.../12-801-1.html
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

HomeBrewer wrote:
>
> On my other cars I can hear the pump when the key is on, but if I don't
> start the car the pump quits after a few seconds, the jeep just keeps
> running.
>
> --
> _____________________
> HomeBrewer
> 76-81-85CJ7
> All in one Jeep

 

HomeBrewer did pass the time by typing:
> On my other cars I can hear the pump when the key is on, but if I don't
> start the car the pump quits after a few seconds, the jeep just keeps
> running.

Yep. Different system with the fuel pump controlled by the engine computer
on a fuel injected application. They pressurize the rail first by running
for 2-4 seconds then shut down. When the key is moved to Start, they pump
runs from that point till when the key is moved to Off. On some vehicles
there is an interlock with oil pressure. As long as there is oil pressure
the fuel pump relay gets power. There are also impact/rollover switches.

You could put in a cutoff switch or safety interlock like race cars use.
Just a simple safety switch that cuts power to the pump. Better to use
a relay for that type of application though.
http://www.action-electronics.com/switches.htm

--
DougW

 

HomeBrewer did pass the time by typing:
> On my other cars I can hear the pump when the key is on, but if I don't
> start the car the pump quits after a few seconds, the jeep just keeps
> running.

Yep. Different system with the fuel pump controlled by the engine computer
on a fuel injected application. They pressurize the rail first by running
for 2-4 seconds then shut down. When the key is moved to Start, they pump
runs from that point till when the key is moved to Off. On some vehicles
there is an interlock with oil pressure. As long as there is oil pressure
the fuel pump relay gets power. There are also impact/rollover switches.

You could put in a cutoff switch or safety interlock like race cars use.
Just a simple safety switch that cuts power to the pump. Better to use
a relay for that type of application though.
http://www.action-electronics.com/switches.htm

--
DougW

 

HomeBrewer did pass the time by typing:
> On my other cars I can hear the pump when the key is on, but if I don't
> start the car the pump quits after a few seconds, the jeep just keeps
> running.

Yep. Different system with the fuel pump controlled by the engine computer
on a fuel injected application. They pressurize the rail first by running
for 2-4 seconds then shut down. When the key is moved to Start, they pump
runs from that point till when the key is moved to Off. On some vehicles
there is an interlock with oil pressure. As long as there is oil pressure
the fuel pump relay gets power. There are also impact/rollover switches.

You could put in a cutoff switch or safety interlock like race cars use.
Just a simple safety switch that cuts power to the pump. Better to use
a relay for that type of application though.
http://www.action-electronics.com/switches.htm

--
DougW

 

You can wire it with a relay through the oil pressure safety switch on
the oil sender with a bypass from the solenoid so it runs when the
starter is turning. Pretty much the same as you wire in a coil.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

HomeBrewer wrote:
>
> I have a holley electric fuel pump on my cj7, it is wired to a switched 12v
> source and runs continusously while the key is on. I don't think this is
> right, what kind of switch can I get and where do I wire it in?
>
> btw, it has a holley avenger truck carb - 4 bbl if that matters
> --
> _____________________
> HomeBrewer
> 76-81-85CJ7
> All in one Jeep

 

You can wire it with a relay through the oil pressure safety switch on
the oil sender with a bypass from the solenoid so it runs when the
starter is turning. Pretty much the same as you wire in a coil.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

HomeBrewer wrote:
>
> I have a holley electric fuel pump on my cj7, it is wired to a switched 12v
> source and runs continusously while the key is on. I don't think this is
> right, what kind of switch can I get and where do I wire it in?
>
> btw, it has a holley avenger truck carb - 4 bbl if that matters
> --
> _____________________
> HomeBrewer
> 76-81-85CJ7
> All in one Jeep

 

You can wire it with a relay through the oil pressure safety switch on
the oil sender with a bypass from the solenoid so it runs when the
starter is turning. Pretty much the same as you wire in a coil.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

HomeBrewer wrote:
>
> I have a holley electric fuel pump on my cj7, it is wired to a switched 12v
> source and runs continusously while the key is on. I don't think this is
> right, what kind of switch can I get and where do I wire it in?
>
> btw, it has a holley avenger truck carb - 4 bbl if that matters
> --
> _____________________
> HomeBrewer
> 76-81-85CJ7
> All in one Jeep

 

> Yep. Different system with the fuel pump controlled by the engine
computer
> on a fuel injected application. They pressurize the rail first by running
> for 2-4 seconds then shut down. When the key is moved to Start, they pump
> runs from that point till when the key is moved to Off. On some vehicles
> there is an interlock with oil pressure. As long as there is oil pressure
> the fuel pump relay gets power. There are also impact/rollover switches.

Good to know. I put a 3.4L in my Cherokee some time ago and it requires use
of an electronic fuel pump. It's still carbureted however. So I'm not sure
about using a pressure interlock. The jeep doesn't get used all that often
and it seems the float eventually runs dry (it's been needing a rebuild for
ages...). So the pump has to run a bit into order to refill the carb and
start running. There wouldn't be any oil pressure yet.

That said, it's a little annoying to hear the pump rumble when the engine's
off but in the run position. It'd be nice to either have a quieter pump or
some sort of cut-off like you mention. Any idea about one suited for a carb
setup? One with some sort of shut-off timer with a pressure sensor override
would seem like the right idea.

> You could put in a cutoff switch or safety interlock like race cars use.
> Just a simple safety switch that cuts power to the pump. Better to use
> a relay for that type of application though.

Agreed, no sense running the full current of what a pump might draw through
a switch. They tend to overheat. Granted a beefier switch would handle it
better. It'd be a toss-up between spending more on the switch or the cost
and the wiring up of a relay circuit.

-Bill Kearney