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Post by petrolhead allan on Sept 2, 2014 19:22:04 GMT
Allan, I had a similar problem with an early 1800cc Peugeot 504 many years ago. For some reason that I never worked out, the carby bowl would siphon itself empty when sitting. The petrol would siphon out the cold-start jet of the Solex carby, despite the little valve designed to prevent this. This meant more engine cranking was required before it fired when starting after sitting for more than a couple of hours. The mechanical fuel pump was fine and didn't need to be replaced, so I fitted an old SU electric pump that I had lying around. I installed it between the tank and the original pump and wired it so that it only ran when I pressed a button under the dash. It was in effect just a priming pump. The valves of the mechanical pump would allow fuel to be pushed through it with little obstruction when not operating, and the electric pump's valves allowed fuel to be drawn through it when it wasn't running. If your mechanical pump is OK, try fitting a Facet in this way. I'm fairly sure that it would offer minimal resistance to petrol being pulled through it when not operating. Others will know. Thanks for the info, Warwick. I have one of the club-supplied replacement mechanical pumps, which has only done a few miles and is working fine. I checked it by loosening the petrol pipe unions at the carbs and petrol flows (after I've had the engine running, that is!) Your suggestion of using an electric pump as a 'priming' pump sounds interesting, and a button to operate it would overcome the possibility of the pump continuing to run in the event of an accident. I just need to be certain that the electric pump I choose will not provide too much restriction when switched off. |
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Post by Warwick on Sept 3, 2014 3:34:01 GMT
One simple way of shutting off an electric pump after a collision is to energise it via a relay connected to the oil pressure switch. Engine stops, no oil pressure, pump stops.
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Post by eisdielenbiker on Sept 3, 2014 8:11:18 GMT
For some some years I have a very nice contempory crash fuel cut off switch from a Jag XJ6 installed. Will go for a picture soon. It's a funny and reliable device. There is some steel ball rolling inside a funnel I guess. If it gets a hard impact the ball leaves leaves the funnel and this lets off electric contact... a bad example |
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Post by enigmas on Sept 3, 2014 11:15:47 GMT
The small Facet pump is a great little, reliable pump for a minimal outlay. I've had one fitted to my 3.5 litre V8 powered MG Magnette for years. Its mounted on the engine firewall on 2 small rubber mounts (each mount is about 2cm tall and 1.5cm in diameter). Currently there's no insulation on the inside of the firewall. There's hardly any noise transmission if mounted like this and it's certainly not audible when the engine is running. If it was mounted under the tank in the boot in this manner it would probably be inaudible. Also, there's absolutely no maintenance involved. The output pressure also suits the needle and seat requirements of the twin Zenith Stromberg CD carburettors as it would SUs. There's quite a range of cutout devices available for de-energising fuel supply systems in the market. Most LPG systems have a small electronic module that runs off the ignition circuit (sensing pulsing) that can easily be adapted to do the job. www.peelinstruments.com.au/page16.html |
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Post by Warwick on Sept 3, 2014 11:46:44 GMT
Mark,
That reminded me that I had something similar I installed in the 504. I can't remember why, or where it came from - but I think it was an after-market device.
Vince,
That's an interesting way of achieving it. I'd never thought about what was done with LPG installations.
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Post by johnwp5bcoupe on Sept 3, 2014 14:59:11 GMT
The small Facet pump is a great little, reliable pump for a minimal outlay. I've had one fitted to my 3.5 litre V8 powered MG Magnette for years. Its mounted on the engine firewall on 2 small rubber mounts (each mount is about 2cm tall and 1.5cm in diameter). Currently there's no insulation on the inside of the firewall. There's hardly any noise transmission if mounted like this and it's certainly not audible when the engine is running. If it was mounted under the tank in the boot in this manner it would probably be inaudible. Also, there's absolutely no maintenance involved. The output pressure also suits the needle and seat requirements of the twin Zenith Stromberg CD carburettors as it would SUs. There's quite a range of cutout devices available for de-energising fuel supply systems in the market. Most LPG systems have a small electronic module that runs off the ignition circuit (sensing pulsing) that can easily be adapted to do the job. www.peelinstruments.com.au/page16.htmlI like that safety switch Vince you can hide it easily! I have emailed the company for info on the tech side and price  |
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Post by enigmas on Sept 3, 2014 22:53:51 GMT
Yes, it's a great little module John, about half the size of a matchbox and very easily wired to the car.  |
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