chris_smith
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| posted on 27/9/05 at 08:46 AM |
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inertia switch??!!
is it an sva requirement for an inertia switch to be fitted on fuel pump???
cheers in advance chris
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rayward
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| posted on 27/9/05 at 08:52 AM |
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if your using a high pressure(injection fuel system) Yes.
a bloke on ebay was selling them for £7.99
Ray
[Edited on 27/9/05 by rayward]
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Mix
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| posted on 27/9/05 at 09:13 AM |
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Ray
Where do you get that info from? I can't find a reference to it 
Mick
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MikeR
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| posted on 27/9/05 at 09:37 AM |
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not sure if its a requirement but as i've said before my mate who does FI systems in production cars swears we're all going to die in a
firey inferno.
Since talking to him, i'm thinking of fitting one - just got to figure out how to do it / where to get one from.
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rayward
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| posted on 27/9/05 at 09:47 AM |
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will try and find the relevant bits of info from the manual.
here's the link for ebay switches £7.99 inc P+P NTDWM
cLiCk HeRe
Ray
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chris_smith
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| posted on 27/9/05 at 10:00 AM |
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yeah thats the one i was lookin at 
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DarrenW
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| posted on 27/9/05 at 10:18 AM |
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Ref it being an SVA requirement - i dont think it is referenced directly in the manual but seeing as OEM's use them the tester may well cite it
as a good thing to have and therefore make it a fail point. Im sur ethey wont have to try hard and find an arguable statement in the book. For a few
quid its probs a good idea.
If you are using a mech pump am i right in assuming there isnt anything similar that can be used? (ie are inertia switches only electrical?)
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rayward
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| posted on 27/9/05 at 10:28 AM |
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main reason for the inertia switch is usually an electric pump sits in the tank and pumps fuel from te tank to the engine, and in injection systems,
back to the tank again, if the car is crashed, there is a chance a fuel laine will be severed, and if the pump keeps pumping will spray fuel
everywhere.
the mechanical fuel pumps are fitted to the engine and draw fuel from the tank, so the need to shut them off is less.
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NS Dev
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| posted on 27/9/05 at 12:35 PM |
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It is not a requirement that I have ever seen.
If the injection line is fractured, the engine stops instantly (almost), and if it stops, any half decent injection system (incl most if not all road
car systems) will cut the power to the fuel pump (in the absence of pulses from the crank position sensor)
My MBE systems never use an inertia switch.
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JAG
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| posted on 7/10/05 at 01:05 PM |
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I've got this inertia switch (the one in the Ebay link) on my injected Mazda MX5 engine.
I got it from under the centre console of a Rover 214 in my local scrapyard - he charged me £5 for it. It's now mounted on the engine side of my
bulkhead near the relays and fuses.
If you're sitting in the drivers seat of a Rover 214/216/414/416 the switch is located behind the centre console, just behind the radio/stereo
etc... under the trim panels.
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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MikeR
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| posted on 7/10/05 at 05:38 PM |
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oh well, i bought one from ebay - got it now so no worries.
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NS Dev
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| posted on 11/10/05 at 03:26 PM |
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quote:
Originally posted by rayward
main reason for the inertia switch is usually an electric pump sits in the tank and pumps fuel from te tank to the engine, and in injection systems,
back to the tank again, if the car is crashed, there is a chance a fuel laine will be severed, and if the pump keeps pumping will spray fuel
everywhere.
the mechanical fuel pumps are fitted to the engine and draw fuel from the tank, so the need to shut them off is less.
just going back to this one, on an injection car the fuel delivery should stop just as surely as it will on a car with a mech pump. If the fuel line
fractures, the engine stops, the tachometric fuel pump relay or the ECU detects the lack of pulses and stops the pump.
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