Electric fuel pump safety switch
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Laughing Gas
Joined: Jun 2016
Posts: 855
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From: Des Moines, Washington
Electric fuel pump safety switch
So I'm poking around looking for ideas to make an electric fuel pump install safer, meaning shutting it off in the event of a crash and I found this article and more specifically the switch recommended in it.
I'm liking it, I've never been excited about just running power straight from the key nor through a regular pressure switch. The PS-64 switch is specifically designed for use with an electric fuel pump.
This all came up 'cause I'm pretty sure the neighbors are tired of hearing the rusty old truck cranking and cranking and cranking to get fuel into the carb so it can lumber into life.
Michael
I'm liking it, I've never been excited about just running power straight from the key nor through a regular pressure switch. The PS-64 switch is specifically designed for use with an electric fuel pump.
This all came up 'cause I'm pretty sure the neighbors are tired of hearing the rusty old truck cranking and cranking and cranking to get fuel into the carb so it can lumber into life.
Michael
Tuned
Joined: May 2016
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When I put my electric pump in. I went to the parts store and asked for there book with all the switches. I looked through it until I found a switch with the thread size of wanted and would only come on with 4/7 psi of pressure. I put it in a tee in my oil pressure sensor port. And used a relay run using my coil wire as a trigger. And ran the ground of the relay through the pressure switch. It had not failed me yet and the whole set up with. The switch and relay was inexpensive.
Moderator & parts slinger
Joined: Feb 2007
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From: S/W Missouri, Polk county
Great "article", thanks for the link, I like that info alot, especially since I am converting the Bronco to a TBI and ditching the mechanical pump for an electric one.
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Laughing Gas
Joined: Jun 2016
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From: Des Moines, Washington
When I put my electric pump in. I went to the parts store and asked for there book with all the switches. I looked through it until I found a switch with the thread size of wanted and would only come on with 4/7 psi of pressure. I put it in a tee in my oil pressure sensor port. And used a relay run using my coil wire as a trigger. And ran the ground of the relay through the pressure switch. It had not failed me yet and the whole set up with. The switch and relay was inexpensive.
Michael
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Joined: Jul 2005
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There are also Inertia Switches which Ford put in most, if not all, vehicles with an electric fuel pump. One of those will stay closed until it senses an impact, at which point it will open, stopping the pump even if your engine continues to run. Simply press the button to reset back to closed.
Cars always seem to have them mounted in the trunk/hatch area, while trucks, at least older Rangers, have them mounted inside the cab near the firewall.
Cars always seem to have them mounted in the trunk/hatch area, while trucks, at least older Rangers, have them mounted inside the cab near the firewall.
Thread Starter
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Laughing Gas
Joined: Jun 2016
Posts: 855
Likes: 56
From: Des Moines, Washington
There are also Inertia Switches which Ford put in most, if not all, vehicles with an electric fuel pump. One of those will stay closed until it senses an impact, at which point it will open, stopping the pump even if your engine continues to run. Simply press the button to reset back to closed.
Cars always seem to have them mounted in the trunk/hatch area, while trucks, at least older Rangers, have them mounted inside the cab near the firewall.
Cars always seem to have them mounted in the trunk/hatch area, while trucks, at least older Rangers, have them mounted inside the cab near the firewall.
I'm only 6' tall yet could reach that thing far more often than the driver liked.
Michael
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From: S/W Missouri, Polk county
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Fleet Owner
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From: NorCal
There are also Inertia Switches which Ford put in most, if not all, vehicles with an electric fuel pump. One of those will stay closed until it senses an impact, at which point it will open, stopping the pump even if your engine continues to run. Simply press the button to reset back to closed.
Cars always seem to have them mounted in the trunk/hatch area, while trucks, at least older Rangers, have them mounted inside the cab near the firewall.
Cars always seem to have them mounted in the trunk/hatch area, while trucks, at least older Rangers, have them mounted inside the cab near the firewall.
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https://www.ebay.com/itm/Fuel-Pump-E...YAAOSwcB5ZMh4F
I've never used one of these, but heard good things - it lets the pump run for 3 seconds with key-on to prime up the bowl, then uses tach signal instead of oil pressure to signal on/off. The 3-second on part was what I liked, you don't have to spin the motor to fill the carb back up. But it does cost more -
I've never used one of these, but heard good things - it lets the pump run for 3 seconds with key-on to prime up the bowl, then uses tach signal instead of oil pressure to signal on/off. The 3-second on part was what I liked, you don't have to spin the motor to fill the carb back up. But it does cost more -
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Laughing Gas
Joined: Jun 2016
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From: Des Moines, Washington
That's the "passenger engine shutdown pedal" I mentioned above. Every time I stretched, I hit the darn thing and shut his truck down. He didn't like it much.
Michael
Fleet Mechanic
Joined: Mar 2005
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From: Wichita Falls TX
https://www.ebay.com/itm/Fuel-Pump-E...YAAOSwcB5ZMh4F
Just purchased one of these! Thanks for the link. I'm (slowly) doing the FiTech EFI with the Tanks Inc in-tank pump / 38 gallon tank.
David
Just purchased one of these! Thanks for the link. I'm (slowly) doing the FiTech EFI with the Tanks Inc in-tank pump / 38 gallon tank.
David
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