Removing lpg injector rails

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Removing lpg injector rails

#1 Post by Mike94 » Fri Sep 11, 2020 9:51 am

Hi all, new to forum.

I'm changing the intake manifold gasket on my vauxhall Monaro VXR and need to remove the 2 main lpg hoses that connect to each injector rail.

Does anyone know if lpg will spew out at high-pressure if I remove them? Is the high pressure lpg only before the vaporizers? Any help would be appreciated.

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Re: Removing lpg injector rails

#2 Post by LPGC » Fri Sep 11, 2020 10:43 am

Gas shouldn't spew out of those rubber pipes.

Rubber pipes are on the low pressure side of the vaporiser / pressure reducer unit.

There should be an electronic gas shut off solenoid valve in the high pressure gas feed just before the vaporiser/reducer which should automatically prevent much gas escaping if you disconnect a rubber pipe (when the solenoid is closed no gas from the high pressure pipe can reach the vaporiser/reducer).

There should also be an electronic gas shut off solenoid on the tank, this works in the same way as the solenoid in the engine bay but prevents gas from the tank reaching the high pressure line between the tank and the engine bay.

However, if the vaporiser/reducer (engine bay) solenoid has been disabled (so is constantly open) any liquid gas from the high pressure line under the car could make it's way into the rubber pipes if you disconnect a rubber pipe. In this case there'd only be the quantity of liquid gas in the main feed pipe that could escape if you removed a rubber pipe. If both the engine bay solenoid and tank solenoid are disabled (constantly open) you could lose all the gas from the tank by leaving a rubber pipe disconnected and walking away... but the rate of the gas leak would be relatively slow compared to a high pressure leak and you'd be able to reconnect the rubber pipe.

If your tank is the multivalve type it will have a manual shut-off tap/lever that you can close. You can then run your car on LPG until all the gas from the lines has been used (with the valve tap/lever closed no gas can enter the system even with the solenoid valves open).

Most likely you could just disconnect the rubber pipes, just get a short pop/hiss and the gas leak will stop. But note the 'however' bit above, you may feel more comfortable manually turning off gas at the tank.
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