Gas leak detector

[Chucaro]

I am after a detector for occasional use in my RRC.
I appears to me that is a leak on the diaphragm but without a tester is hard to say.
I do not want to use a match :p
Can any of you recommend one tester that is reasonable priced?
Cheers
Arthur

[Ancient Mariner]

I am after a detector for occasional use in my RRC.
I appears to me that is a leak on the diaphragm but without a tester is hard to say.
I do not want to use a match :p
Can any of you recommend one tester that is reasonable priced?
Cheers
Arthur
Detergent and water mix brush on and look for bubbles

[101RRS]

Jaycar sells one for about $40 but the air needs to be perfectly still.

[Chucaro]

So in both options it cannot be tested with the engine running.
With the ignition on (without crank the engine) should be gas on all the lines?
The engine is a V8 3.9 fuel injected.

Cheers

[Ancient Mariner]

Soapy water will work with the engine running ,fairly dear tho:o

[DeeJay]

Occasional use??

https://www.aulro.com/afvb/images/imported/2014/12/378.jpg



:)

[bee utey]

Occasional use??

https://www.aulro.com/afvb/images/imported/2014/12/378.jpg



:)
:) Noses are good for finding the general area of a leak, soapy water lets you home in on the exact spot. Note that a bit of caution is needed, some leaks are big enough to blow the soapy water right away from the leak making it important that you observe the area very carefully as you apply the liquid. The only real advantage of a gas leak detector over a properly calibrated nose is the length variable...

[d2dave]

With the ignition on (without crank the engine) should be gas on all the lines?
The engine is a V8 3.9 fuel injected.

Cheers

Is this a duel fuel? If so and being injected they are usually set up that they start on petrol and then switch to gas.

This being the case, there would be no gas present with out engine running.

[Chucaro]

Is this a duel fuel? If so and being injected they are usually set up that they start on petrol and then switch to gas.

This being the case, there would be no gas present with out engine running.

I used to have a 1978 109 Stage 1 running on dual fuel and yes I start it on petrol and then switched to gas but not in this one.
Do you mean for a usually set up as something automatic or just the common norm?
The change over is manual like on the 3.5 carby 109 and so far I never run it on petrol.

Some people believe that should run on petrol offten because the valves seats other said that the 3.9 have strong valve seats.
I was considering to install a valve saver on it.

I have this RR for only 3 weeks.

[DeeJay]

So in both options it cannot be tested with the engine running.
With the ignition on (without crank the engine) should be gas on all the lines?
The engine is a V8 3.9 fuel injected.

Cheers

For a RRC Classic era vehicle, I'm pretty sure the solenoid will only open when you crank the engine over. There may be gas pressure in the line left over from last run though. Some of the earlier safety devices had a relay that powered the gas valves ( solenoids) from when you cranked it, not just turning on the ignition. Using my '85 County as the experience.

[Chucaro]

So, chances are that the smell of gas after the engine has switched off is for residuals in the engine bay components?

[DeeJay]

So, chances are that the smell of gas after the engine has switched off is for residuals in the engine bay components?

There will be a solenoid ( electric fuel switch) at the tank & one before the Mixer on the carbies. If the smell goes away after a while, then it probably is gas leaking from the line past the converter. I would give it a run then immediately spray soapy water over the suss area's after engine stopped. The problem is tho, they are liquid lines & soapy water might not bubble up.

[d2dave]

There will be a solenoid ( electric fuel switch) at the tank & one before the Mixer on the carbies.

Chucky. Is this carby or fuel injected? You will find the shut off solenoid before the convertor, not before the mixer.

[Chucaro]

It has a fuel injected 3.9 V8 (ex Disco).

[d2dave]

Ok, find the shut off solenoid on the convertor. Stick a test light on the positive terminal. Now get someone to turn on the ignition. If the test light lights it should go off after about one second.(option one)

If it doesn't light, start the car. If it lights after a few seconds and stays on this is what is happening.(option two)

If you get option one this means the car starts on gas.
If you get option two, this means it is starting on petrol and then automatically switches to gas. This is what happens on later cars(mid 90's on) but don't know how yours works.

If you have option one, by getting someone to repeatably cycle the ignition switch you will flood gas to the convertor and possibly beyond and you might be able to find the leak.

If it is option two, gas will only flow with engine running, controlled by an ECU

[Chucaro]

Thanks Dave, I will have a look tomorrow.
I am 90% sure that it start in gas and only will start in petrol if I do the change over manually.
It takes about 3 seconds or more to start in gas when cold.