About to install my silver top facet fuel pump into the car. Running the lines inside with a filter king and regualtor.
Do I need to install an oil preasure switch in there, as the insturctions state.So it would stop the preasure building up to high if the engine is not running. If I do need one, what one should I get? I'm sure the switch would activate at different times for different cars.
Cheers.
Facet fuel pump. Do I need a oil preasure switch?
Started by
TrialsLife
, Feb 22 2007 06:40 PM
11 replies to this topic
#1
TrialsLife
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Posted 22 February 2007 - 06:40 PM
#2
The Matt
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Posted 22 February 2007 - 07:33 PM
So you'd have an oil pressure switch that would turn the pump off when the oil pressure drops? No fuel pump without oil pressure? How would the engine start? Or did you mean a fuel pressure switch, that cuts off above a certain fuel pressure.
A fuel regulator is the norm. might be a good idea to fit an inertia switch in the boot so it cuts off in the event of a bump.
A fuel regulator is the norm. might be a good idea to fit an inertia switch in the boot so it cuts off in the event of a bump.
#3
dklawson
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Posted 22 February 2007 - 08:21 PM
The oil pressure safety switches typically have two sets of contacts... one to operate your light in the normal manner (normally closed, open under pressure) and contacts that are normally open and close under pressure to maintain power to the pump. Typically, just like with a ballast coil connection, you use these with a 4-terminal starter solenoid. A connection is run between the 4th terminal on the solenoid and the pump-side terminal of the safety switch so the pump is powered while you turn the engine over on the starter.
I've been told that a better safety device to add is a roll-over or inertia switch. I have no personal experience with them. The logic behind there use is that you may be in a serious collision that ruptures a fuel line but the engine is still running (you still have oil pressure). The pump would continue to run until the float bowls run dry which is dangerous if the gas is being dumped on the ground. The inertia switch would kill power to the pump in the event of a major impact.
I don't know what to suggest for you in the U.K. I believe Holley in the U.S. sells such safety switches (oil pressure and roll-over/inertia).
I've been told that a better safety device to add is a roll-over or inertia switch. I have no personal experience with them. The logic behind there use is that you may be in a serious collision that ruptures a fuel line but the engine is still running (you still have oil pressure). The pump would continue to run until the float bowls run dry which is dangerous if the gas is being dumped on the ground. The inertia switch would kill power to the pump in the event of a major impact.
I don't know what to suggest for you in the U.K. I believe Holley in the U.S. sells such safety switches (oil pressure and roll-over/inertia).
#4
Dan
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Posted 22 February 2007 - 10:19 PM
dangerous if the gas is being dumped on the ground.
Or into an upside-down passenger cabin, while burning. A friend of a friend of mine was in a rollover crash in America and had both legs burned clean through by a jet of burning fuel. IMHO electrical fuel pumps are very dangerous without some form of safety cutout. Even if you use an oil pressure switch system without a cranking bypass for the pump, there should be enough in the float bowl to start the car unless it's been standing for a very long time and the fuel level is quite low in the tank (if the tank is nearly full, gravity will keep the float bowl full while the car isn't running as the Mini's tank is mounted quite high up compared to other cars). Innertia switches react to a crash faster and more reliably but can be troublesome with potholes or adventurous driving. Most have C/O type switching and so can be used to light a dash warning to show when the switch has tripped.
#5
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#6
Udo
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Posted 22 February 2007 - 11:16 PM
Even cheaper if go down your local scrap yard!
Got mine for a quid, 5 mins work in a ford Mundane passenger footwell and never had a problem with it tripping out due to bumps potholes railway lines etc
Got mine for a quid, 5 mins work in a ford Mundane passenger footwell and never had a problem with it tripping out due to bumps potholes railway lines etc
#7
biggav
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Posted 22 February 2007 - 11:30 PM
My local scrappy won't let anything go for less than £5 plus vat.... that'll be £5.88 mate!! That said... he does have 15 mini's in stock and 3 sheds full engines and pretty much any part i could want to lay my hands on... and occasionally lets me have things for free!!
#8
Turbo Nick
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Posted 23 February 2007 - 07:54 AM
had a mundano one in my car for the past 3 years too and it's never tripped once yet due to potholes etc. definately worth the couple of quid they cost.
#9
The Matt
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Posted 23 February 2007 - 08:01 AM
Yeah, I was thinkin of goin to a scrappy for one. Might end up gettin one off egay though.
If they are just two wires, do they just go in line on the positive feed to the pump, or do they need to go via a relay?
If they are just two wires, do they just go in line on the positive feed to the pump, or do they need to go via a relay?
#10
Udo
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Posted 23 February 2007 - 08:06 AM
I have the pump on a relay anyway with the kill switch on the switched side of it
#11
The Matt
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Posted 23 February 2007 - 08:11 AM
Yeah. I will probably do the same.
#12
icklemini
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Posted 25 February 2007 - 10:59 PM
Am with dan on this...
ok there is two type of 'cut offs' for the electric fuel pumps...
the most popular is the inertia switch... if you have a bump than it trips and the supply to the pump is cut...
the other is based on oil pressure - if there is no oil pressure than the supply to the pump is cut. On a carb car that has a fuel float, starting isnt usually a problem as there is enough fuel in the carb float bowl to start the car (at which point the oil pressure is up and the pump starts)
you need to fit one or the other and a requlator is highly recommended to control the pressure...
hth,
Dave
ok there is two type of 'cut offs' for the electric fuel pumps...
the most popular is the inertia switch... if you have a bump than it trips and the supply to the pump is cut...
the other is based on oil pressure - if there is no oil pressure than the supply to the pump is cut. On a carb car that has a fuel float, starting isnt usually a problem as there is enough fuel in the carb float bowl to start the car (at which point the oil pressure is up and the pump starts)
you need to fit one or the other and a requlator is highly recommended to control the pressure...
hth,
Dave
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