Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[nordic]

I have a 3.0 V6 with Tartarini LPG conversion.

Having replaced the rocker cover gaskets and thermostat I discovered that the vacuum pipes were glued, taped and even blocked off.

Following the excellent diagram found on here, I replaced and connected the vacuum pipes correctly. It now works great on petrol (with only the rear multi-ram not working)

However, when on gas, when I turn the temperature in the cabin to low the regulator freezes and dumps lpg into the engine bay.

I am told that you have to block a vacuum pipe off to keep the flow of hot water to the regulator continuous.

What vacuum pipe(s) do I have to block?

Any help would be great - cheers

Andy

[JamesV6CDX]

I reckon your coolant feed has been Tee'd into the heater circuit, rather than taken directly from the coolant bridge before the HBV. A common bodge

I imagine they're on about preventing any vaccum going to the HBV, so the heat goes around that part of the circuit.

Plumbed correctly, you shouldn't have to "block off" any vaccum pipes.

"LPGA Approved" installer strikes again?

[nordic]

So I should block off the vacuum pipe going to the HBV so there is no vacuum to it at all?

Thus, keeping the regulator heated all the time?

Andy

[Kevin Wood]

Agreed. Vaporiser has been plumbed incorrectly so its' coolant flow is stopped by the HBV. Installer has realised their error and bodged the HBV to try to prevent this.

The feed to the vapouriser needs to be taken from the hose that runs from the coolant bridge to the HBV, not after the HBV.

[JamesV6CDX]

So I should block off the vacuum pipe going to the HBV so there is no vacuum to it at all?

Thus, keeping the regulator heated all the time?

Andy

Hi Andy,

In a word, no. It needs plumbing correctly...

Cheers,
James

[nordic]

If I had the time or a good LPG installer in my area that would be the best solution.

However, in the short term, would blocking the vacuum pipe leading to the Heater Bypass Valve solve my problem of the regulator/vapourisor freezing when the heater was turned to cold?

Many thanks,

Andy

[albitz]

Had the exact same problem on my car (approved installer) fixed it myself.Just a matter of taking the plenum off and doing a bit of replumbing of the pipework.Might be best to get hold of some spare hoses etc. in case you need them. Depends on the degree of bodging involved really.

[feeutfo]

Coolant bridge coolant out, to hbv as standard.

Needs to be

Coolant bridge> vapourisor > hbv.

[nordic]

Damn - just took all that off!

In the very short term would blocking HBV work?

cheers,

Andy

[feeutfo]

No. You'll have no heat in the car either. (if I understand your situation correctly)

Try to acquire metal elbows for the coolant pipe joints, with spring clips instead of jubilees if at all possible.

[The Red Baron]

I reckon your coolant feed has been Tee'd into the heater circuit, rather than taken directly from the coolant bridge before the HBV. A common bodge
I imagine they're on about preventing any vaccum going to the HBV, so the heat goes around that part of the circuit.

Plumbed correctly, you shouldn't have to "block off" any vaccum pipes.

"LPGA Approved" installer strikes again?

as i found out. now re-plumbed.

[nordic]

It should not be that difficult a job - its just that I have to work outdoors and have to race against the weather and darkness.

So its Coolant Bridge > Vapouriser > HBV.

Piping is cheap enough.

Thanks for all the help guys - much appreciated

Andy

[Entwood]

Temporary fix ONLY ... if I read it right ...

Take the vac pipe off the HBV, very thin pipe on the top, then block the end of that thin pipe with a suitable bolt.

HBV will now be "open" and so give full heat to the heater circuit .. and probably your badly plumbed vapouriser .. at all times.

The blocked vac pipe will prevent any loss of vac to other services, as well as preventing the inducing of a "vac leak"

This is a short term fix until you replumb it correctly ..

[nordic]

Many thanks for confirming this temporary solution.

Can't belive the LPG installer could have made such a mistake!

Cheers

Andy

[Lazydocker]

Many thanks for confirming this temporary solution.

Can't belive the LPG installer could have made such a mistake!

Cheers

Andy

Afraid I can... Seen many "Professional" conversions done this way (unfortunately)