Fuel cut off solenoid - where and how?

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DOUGAL
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Fuel cut off solenoid - where and how?

Post by DOUGAL » Mon May 21, 2018 12:09 pm

I've searched the web but haven't found satisfying answers.
Where is the best location for the fuel cut off solenoid to be mounted. I know not in the engine bay but where do you fix it to the bus?
Is it better to have the fuel filter before or after the solenoid? (before = between tank and solenoid, after = between solenoid and carb).
How does this get wired so it only works with the ignition on and where do you install the inline fuse?
Hopefully someone can help as although it might be straight forward I can't find the info I want.

Cheers,
Gertjan
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Re: Fuel cut off solenoid - where and how?

Post by Stevep » Mon May 21, 2018 12:19 pm

Mine is fitted under the fuel tank mounted to the chassis and wired to the fire extinguisher and feed is from the coil. Any questions ring Pete Shaw at vw Aircooled works


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Re: Fuel cut off solenoid - where and how?

Post by vwJim » Mon May 21, 2018 12:26 pm

Before the filter I'd say, to make replacing the filter easier.
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Re: Fuel cut off solenoid - where and how?

Post by Stevep » Mon May 21, 2018 12:34 pm

The shut off solenoid has a built in filter!


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Re: Fuel cut off solenoid - where and how?

Post by type21f » Mon May 21, 2018 12:47 pm

Not all...
I fitted a 12v 0-3 bar Durite cut off solenoid and ceramic filter under the bus.
My fuel cut off valve is just below the fuel tank. I cleaned the tank and mesh filter and fitted a new outlet seal. I increased the bore of feed pipe from tank to 8mm. The fuel cut off valve feeds into an alloy bodied ceramic filter. All out of sight in the region of the gearbox tunnel.
G
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Re: Fuel cut off solenoid - where and how?

Post by Stevep » Mon May 21, 2018 12:56 pm

ImageImage


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Re: Fuel cut off solenoid - where and how?

Post by Sjtw » Mon May 21, 2018 1:44 pm

Mine is the same as Stevep. Mounted to the chassis rail just as the pipe comes out of the tank.
Filter is included in it with this version and it’s shuts the fuel off if the extinguisher is activated.
Great bit of kit to have.
Steve

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Re: Fuel cut off solenoid - where and how?

Post by DOUGAL » Mon May 21, 2018 1:58 pm

Stevep wrote:
Mon May 21, 2018 12:34 pm
The shut off solenoid has a built in filter!


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Not the one I got!
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Re: Fuel cut off solenoid - where and how?

Post by DOUGAL » Mon May 21, 2018 2:01 pm

Sjtw wrote:
Mon May 21, 2018 1:44 pm
Mine is the same as Stevep. Mounted to the chassis rail just as the pipe comes out of the tank.
Filter is included in it with this version and it’s shuts the fuel off if the extinguisher is activated.
Great bit of kit to have.
I don't have an extinguisher where I can connect it to either.
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Re: Fuel cut off solenoid - where and how?

Post by Stevep » Mon May 21, 2018 2:09 pm

I would look into the full fireboy system for peace of mind it could save your bus !!!


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Re: Fuel cut off solenoid - where and how?

Post by DOUGAL » Mon May 21, 2018 2:16 pm

Yes but I've spent the money on an extinguisher quite a few years ago and it is still in good order. And I don't want to spend another couple of hundred as I've got all the parts.
I just want to install a fuel cut off solenoid (which I bought a few years back but have not fitted yet).

If it's fed from the coil it will only be live when the ignition is on, correct? Does an inline fuse need to be installed?
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Re: Fuel cut off solenoid - where and how?

Post by Stevep » Mon May 21, 2018 2:31 pm

Yes, I fit a new inline fuse to everything electrical I put on my bus!


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Re: Fuel cut off solenoid - where and how?

Post by Stevep » Mon May 21, 2018 2:48 pm

VW Aircooled Works – Installation guidance for Fuel cut-off solenoid kit

The kit that you have purchased contains a state of the art combined filter and shut off valve. The unit has been pre-assembled including tail fittings that have been secured using biofuel resistant thread sealant. The filter is replaceable and the ceramic filter and “O” ring kit can be purchased from VW Aircooled Works, we would recommend the filter is replaced every 24 months under normal conditions. This solenoid does away with the nasty plastic filters that are prone to cracking, but ensure your tank is in good rust free condition to avoid prematurely blocking the ceramic filter.

The kit also comes with fuel line that is resistant to 100% ethanol and is basically ‘fit and forget’ with a minimum 25 year life expectancy under normal conditions. It is therefore essential that time is spent ensuring that the kit is fitted correctly to ensure years of trouble free motoring.

Installation recommendations:

1. Fully drain the fuel tank. You can check the state of the tank for rust or residue coming out
2. The vehicle should be carefully and safely jacked up at the back, or ideally speak to a friend with a ramp to gain access to the fuel tank. Never rely on a trolley jack alone always use axle stands and ensure van is on firm ground.
3. Remove the fuel line at the bottom of the fuel tank outlet. Be careful not to bend the swan neck outlet as if the cracks it will be an engine and fuel tank out job.
4. Remove all the existing fuel line taking note of the inlet and outlet for the fuel pump.
5. Ensure that your vehicle has a hard line made of cupro-nickel that runs through the bell housing tinware over the inlet manifold of pistons 3 & 4 and follows round to the fuel pump on a standard set up. If this was fuel pipe this must be replaced.
6. Locate the fuel cut-off solenoid on the inside of the RHS (as viewed from engine bay looking forward) chassis leg using the ‘P’ clip provided. Ensure the arrow on the body of the solenoid points towards the engine. See picture below.
7. Cut the Biofuel line into appropriate segments with a sharp Stanley or similar this is reinforced hose so take your time. Connect the fuel line and secure with the fuel clips provided. Do not over tighten the clips but ensure that the clips do not turn when finger pressure applied.
8. The fuel solenoid should be wired in series using the twin core cable that came with the VW Aircooled Works Fire suppression system as per the diagram below. The solenoid has two black wires and the positive and negative can be connected to either, using the blue butt connectors provided. Cut the twin cable and bare both the positive cut ends and then insert them into one side of the butt connector together. Insert one of the black wires from the solenoid in the other end. Repeat for the negative wires. So basically the solenoid is now connected in series and when the extinguisher activates the solenoid will cut off.



Once all the fuel lines have been replaced and the fire extinguisher and solenoid connected then the system needs to be checked carefully to ensure no fuel leaks. Run the engine up and check around the tank, solenoid and all the fuel clips for any fuel leaks. Rectify any leaks by retightening the fastenings. The tails for the solenoids have been pre-fitted and sealed with E85 resistant thread sealant these should be leak free.
To test the system remove one the wires going from earth to the pressure sender. The engine will continue to run for a short while until the float chamber in the carburettor empties. The engine should then stall which confirms that the solenoid has closed off as the negative side of the circuit has been disconnected, as it would if the extinguisher activated.
In the event of activation once the repair to the engine has been made to operate the solenoid you will need to by-pass the pressure sender. Simply remove the two lucar connectors from the pressure sender on the extinguisher head and connect the two wires together using the male/male connector provided in the kit.


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Re: Fuel cut off solenoid - where and how?

Post by mickyh » Thu May 24, 2018 7:14 am

This maybe a silly question but why do you need one? If you have a mechanical pump this stops the fuel when the ignition is switched off. I understand the solenoid is connected to a fire extinguisher but if your extinguisher is not electric once again why do you need one?

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Re: Fuel cut off solenoid - where and how?

Post by Stevep » Thu May 24, 2018 7:36 am

In a fire situation the fuel lines in the engine bay will fail so without a shut off valve fuel will still leak out of the tank by gravity and feed the fire.


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