|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
07-31-2022, 01:20 PM | #1 |
Senior Member
Join Date: Aug 2019
Location: McGregor, IA
Posts: 233
|
Electric fuel pump safety
I’m going to install an electric fuel pump to aid in starting after dormant periods. The installation instructions show using an positive oil pressure switch to prevent the fuel pump from continuing to run in case of an accident. I understand but how long will I have to crank do generate enough oil pressure to close the switch? That may negate the reason I’m installing the pump. Should I just switch the pump at the dash and use it to build pressure before starting or are there other ways like hooking it to the start button?
__________________
Cheers, Jim&Sandy McGregor, IA |
07-31-2022, 01:39 PM | #2 |
Junior Member
Join Date: Nov 2017
Location: Bellevue, WA
Posts: 10
|
Re: Electric fuel pump safety
I have an oil pressure switch on mine and it works fine.
Starts right up. The switch doesn’t stop the engine from starting because you will have fuel in the bowl.. Say you were in a wreck….the engine stops running, oil pressure drops and pump shuts off with key still on. Another option is an inertia switch. Most new cars have them in order to shut off elec. fuel pumps in the event of a crash. Find them on Amazon or many other places. Last edited by rickeagle; 07-31-2022 at 02:03 PM. |
Sponsored Links (Register now to hide all advertisements) |
|
07-31-2022, 02:40 PM | #3 |
Senior Member
Join Date: Jan 2011
Location: Central Ohio
Posts: 5,067
|
Re: Electric fuel pump safety
The other thing to consider is a momentary switch (think push-button). It does not take long for an electric pump to fill the fuel bowl and you can usually hear when the pump slows down due to the float closing off the inlet.
On race cars we always install a "roll-over" switch that kills the ignition in case we have an issue . . . same reason. |
07-31-2022, 03:19 PM | #4 |
Senior Member
|
Re: Electric fuel pump safety
I have fitted a few Fit the button as B&S said for priming only .
|
07-31-2022, 03:20 PM | #5 |
Senior Member
Join Date: May 2010
Location: Lower Hutt , New Zealand
Posts: 2,126
|
Re: Electric fuel pump safety
I use a 2 position toggle switch that is sprung so it has to be held when priming. I mounted it in an existing hole at the bottom of the dash so it can't really be seen.
GB
__________________
"you can't make honey out of dog sh*t" "You're a long time looking at the lid" |
07-31-2022, 03:25 PM | #6 |
Junior Member
Join Date: Jul 2022
Posts: 3
|
Re: Electric fuel pump safety
Sponsored Links (Register now to hide all advertisements)
|
07-31-2022, 07:20 PM | #7 |
Junior Member
Join Date: Sep 2015
Location: Victoria BC Canada
Posts: 24
|
Re: Electric fuel pump safety
I have an inertia switch that cuts power to the pump and ignition if the event of an accident
|
07-31-2022, 07:55 PM | #8 | |
Senior Member
Join Date: Aug 2019
Location: McGregor, IA
Posts: 233
|
Re: Electric fuel pump safety
Quote:
__________________
Cheers, Jim&Sandy McGregor, IA |
|
07-31-2022, 07:58 PM | #9 | |
Senior Member
Join Date: Aug 2019
Location: McGregor, IA
Posts: 233
|
Re: Electric fuel pump safety
Quote:
__________________
Cheers, Jim&Sandy McGregor, IA |
|
07-31-2022, 08:01 PM | #10 |
Senior Member
Join Date: Aug 2019
Location: McGregor, IA
Posts: 233
|
Re: Electric fuel pump safety
I think I’ll explore the momentary switch, toggle or push button. Simpler is better and it solves my problem.
__________________
Cheers, Jim&Sandy McGregor, IA |
08-01-2022, 08:01 AM | #11 |
Senior Member
Join Date: Jan 2012
Location: Lyman,ME.
Posts: 2,630
|
Re: Electric fuel pump safety
You can get a three position switch......on-off-momentary on..... with some type of emergency shut off in the -on-position......Mark
__________________
I'm thinkin' about crankin' My ragged ol' truck up and haulin' myself into town. Billy Joe Shaver |
08-01-2022, 09:24 AM | #12 |
Senior Member
Join Date: Sep 2016
Location: sydney australia
Posts: 1,033
|
Re: Electric fuel pump safety
if only for starting and then the mechanical pump takes over a simple push button will work well but if its going to run fulltime then a tachometric relay could be the answer they are used on propane vehicles and when ignition is turned on power up for a short burst to prime the system and when they detect a ignition pulse come on line full time until the ignition pulse stops [eng stalled] then they shut off personally only way i will install an electric pump last thing you need is to have a bender and keep pumping fuel
|
08-01-2022, 09:33 AM | #13 | |
Senior Member
Join Date: May 2010
Location: East Hartford, Ct
Posts: 5,898
|
Re: Electric fuel pump safety
Quote:
__________________
DON'T RECALL DOING SOMETHING FOR MYSELF BASED ON SOMEONE ELSE'S LIKES OR DISLIKES |
|
08-01-2022, 09:59 AM | #14 |
Senior Member
Join Date: May 2010
Location: Liberty, KY
Posts: 901
|
Re: Electric fuel pump safety
I have a oil pressure switch on one of my cars and the previous owner put a toggle switch to bypass the oil pressure switch when starting cold. If you forget to change the toggle switch it will die when it gets the oil pressure up. Don't have to use that toggle the rest of the day of driving.
|
08-01-2022, 11:18 AM | #15 | |
Senior Member
Join Date: Jan 2019
Location: Chicago
Posts: 731
|
Re: Electric fuel pump safety
Quote:
But if only using the elec pump for priming, then seems to me a momentary contact switch on the dash is all you need. As original poster said above, keep it simple. |
|
08-01-2022, 03:51 PM | #16 |
Senior Member
Join Date: Aug 2019
Location: McGregor, IA
Posts: 233
|
Re: Electric fuel pump safety
Thanks for all the ideas. I think I will just use a momentary switch.
__________________
Cheers, Jim&Sandy McGregor, IA |
08-02-2022, 10:40 AM | #17 |
Senior Member
Join Date: Jul 2010
Location: 36 miles north of Albany NY
Posts: 2,950
|
Re: Electric fuel pump safety
|
08-02-2022, 11:50 AM | #18 |
Senior Member
Join Date: May 2010
Location: Coral Springs FL
Posts: 10,944
|
Re: Electric fuel pump safety
Here's how I hooked up my electric fuel pump oil safety switch. The car uses only an electric fuel pump with an ON/OFF toggle switch under the dash. There is no mechanical pump. When you get in the car and flip the
ignition switch lever to ON and also flip the fuel pump toggle switch to ON the electric fuel pump "pumps" gas to the carb. You can then start the car and flip the fuel pump toggle switch to OFF and the fuel pump will still feed gas to the carb as needed. In case of an accident where the engine stops running the oil pressure drops and automatically shuts OFF the pump. The sketched drawing you see was made when the setup was configured as shown in the last two photos. The current set up is shown in the 2nd photo. The same wiring set up to the fuel pump pressure switch applies in both scenarios. The engine is an 8BA. Last edited by 19Fordy; 08-02-2022 at 12:06 PM. |
08-03-2022, 06:08 AM | #19 |
Senior Member
Join Date: Sep 2014
Location: Wiscasset, Maine
Posts: 1,981
|
Re: Electric fuel pump safety
I have a Standard Motor Products PS-64 Oil Pressure Switch
When you are cranking the electric fuel pump is powered regardless of the oil pressure. Once the engine is started the electric pump is powered UNLESS the oil pressure drops below 8psi I believe. I also have an inline toggle switch wired like 19Fordy describes above. This is the wiring diagram. Last edited by glennpm; 08-03-2022 at 06:25 AM. |
08-03-2022, 09:46 AM | #20 |
Senior Member
Join Date: May 2010
Location: Coral Springs FL
Posts: 10,944
|
Re: Electric fuel pump safety
Glenn, When you get a chance, please post your wiring diagrahm.
Thanks. |
|
|
Sponsored Links (Register now to hide all advertisements) |
|