Fuel pump safety shut off?
#2918486
05/04/21 03:24 PM
05/04/21 03:24 PM
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Joined: Jan 2003
Posts: 7,521 Minnesota
Hemi_Joel
OP
master
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OP
master
Joined: Jan 2003
Posts: 7,521
Minnesota
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Who is using some type of automatic fuel pump shut off in case of a crash? I've heard of oil pressure switch and impact sensor. For the oil pressure switch to work, the engine has to die, that might not always happen soon enuff. An impact type could potentially cry wolf on a hard launch in the final round after you've clawed you way thru a 132 car field. So who uses what, how is it working out? Thanks, Joel
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: Fuel pump safety shut off?
[Re: Hemi_Joel]
#2918528
05/04/21 04:43 PM
05/04/21 04:43 PM
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Joined: Jan 2003
Posts: 10,081 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,081
Frostbitefalls MN (Rocky&Bullw...
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How about a Ford starter relay at the positive battery terminal, with a very large mushroom head switch next to the shifter to control it? In a panic situation just slap the button and shut the whole electrical system down. You could also leave the safety switch on so you don't have to unbuckle if you forget!
8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Fuel pump safety shut off?
[Re: gregsdart]
#2918547
05/04/21 05:08 PM
05/04/21 05:08 PM
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Joined: Jan 2003
Posts: 7,521 Minnesota
Hemi_Joel
OP
master
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OP
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Posts: 7,521
Minnesota
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The easy to get at master switch is a great thing, but what if you get beaned and go unconscious or pass out from medical reasons or something? I think that's where an automatic system comes into play.
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: Fuel pump safety shut off?
[Re: Hemi_Joel]
#2918556
05/04/21 05:23 PM
05/04/21 05:23 PM
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Joined: Mar 2009
Posts: 2,490 Sydney,Australia
tex013
top fuel
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top fuel
Joined: Mar 2009
Posts: 2,490
Sydney,Australia
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This is what i use on mine and my customers https://www.ebay.com.au/itm/2746478...Stfqw8AIVEayWCh2VvQbKEAQYBSABEgK78PD_BwEIts a tachometric relay . Ignition on no run 3-5 seconds of power to pump . So you can prime if fuel empty etc . Will shut off when no tacho signal . Very reliable , but if it fails easily bypassed Tex
Last edited by tex013; 05/04/21 05:23 PM.
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: Fuel pump safety shut off?
[Re: tex013]
#2918565
05/04/21 05:38 PM
05/04/21 05:38 PM
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Joined: Jan 2003
Posts: 8,079 Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,079
Tulsa OK
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My EFI will only run the fuel pump when it has crank signal. The problem is EFI can run upside down I imagine so the engine is probably less likely to die unless it takes a direct impact to the crank sensor. Hmmm
68 Barracuda Formula S 340
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Re: Fuel pump safety shut off?
[Re: Hemi_Joel]
#2918623
05/04/21 08:15 PM
05/04/21 08:15 PM
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Joined: Dec 2003
Posts: 23,273 Here
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 23,273
Here
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I have the ford style steel ball electrical cutoff on my cars. I road race. I have set mine off at a inappropriate time, like on off course spin, that then strands the car with approaching traffic. The easy fix was to relocate it so from the drivers seat i could reset it, and get underway. I don't see how a "hard launch" could set it off, unless the gyrations got rather extreme. It seems to need a hard impact, and I'm keeping mine as is.I think they are smart. The street cars get one easy to "kick' as I'm exiting in a potential car jacking(?), leaving the car running long enough to get some distance between me and the gun toting thug driving away.
" All sorts of things can happen when you are open to new Ideas" Inventor of Kevlar
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Re: Fuel pump safety shut off?
[Re: Hemi_Joel]
#2918692
05/04/21 10:48 PM
05/04/21 10:48 PM
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Joined: Mar 2007
Posts: 3,298 West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,298
West Coast, USA
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I use an oil pressure switch, but also added two bypass switches. One to prime the system, the other to disable it for anti-theft. I also have a nitrous type trigger switch on my outboard carbs to kick the pump up to high speed when they are opened. I run a Fuel Labs 2 speed pump.
Of course the switches including the oil pressure switch only interrupt the low amp side of the relays, or the trigger voltage. I use 2 40 amp Bosch relays to feed the fuel pump.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: Fuel pump safety shut off?
[Re: jbc426]
#2918858
05/05/21 12:35 PM
05/05/21 12:35 PM
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Joined: Sep 2003
Posts: 20,235 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 20,235
north of coder
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what kind of sensors do factory auto-shutdown systems use ? i realize they run through the PCM, but they use some kind of sensors don't they ? if so, would it be possible to utilize or modify a couple of factory sensors ?
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Re: Fuel pump safety shut off?
[Re: Hemi_Joel]
#2920665
05/10/21 09:55 AM
05/10/21 09:55 AM
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Joined: Jan 2003
Posts: 18,025 S.E. Michigan
ZIPPY
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 18,025
S.E. Michigan
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I use oil pressure switch to ground the relay.
The switch is the same one Mr Gasket used to sell, it is sourced from a 1974 Chevrolet Vega. There is a matching plug/connector available for it from the same application.
It's not a perfect solution, but at least gives one layer of protection compared to full manual.
Rich H.
Esse Quam Videri
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Re: Fuel pump safety shut off?
[Re: moparx]
#2920804
05/10/21 03:55 PM
05/10/21 03:55 PM
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Joined: May 2012
Posts: 1,892 South Bend
John Brown
top fuel
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top fuel
Joined: May 2012
Posts: 1,892
South Bend
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that vega story reminded me about the vega my brother owned when he was in high school. he always carried around a 5 gallon jug of oil in that thing because it used so much oil, and acted the same way when it was down a few quarts. Yep, Vega's had a three terminal oil pressure switch, and one of the terminals grounded the electric fuel pump. If you didn't have oil pressure, you had a fuel pump that didn't work, so no fuel to the carb. My Vega never let me down, but I did carry a shovel in back cause they could get hung up in snow drifts. In 1974, I sold my daily driver for more than I was asking due to the gas shortage. I never had a gas shortage, cause where I worked we sold Stoddard solvent, which burned just fine when mixed half and half with gasoline, and was even cheaper than gas at the time.
July 19th should be "Drive Like Rockford Day". R.I.P. Jimmie.
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