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Morning, Tried to search to see if there is an existing topic with no luck. With so many people now asking for advice on frugal / economic retro's I was wondering why this topic wasn't being discussed more.
I did work from home, but now must go into the nearest office every day. This I predict is going to cost me 2k a year. So the topic of LPG came up. And I was wondering if anyone had any experience / knowledge.
Has anyone fitted a kit them selves? Does the filler for the lpg tank have to exit through the bodywork or can it be in the boot?
As I have a carb fed CVH, the carb LPG kits seems to be a lot cheaper that single or multi point injection kits.
But I have a mechanical fuel pump, so am unsure how the cut off of petrol and switch over to lpg would work?
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Mr S
Posted a lot
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I've fitted a couple of systems (both single point injection) and will be fitting one at some point in the not too distant future to my Chevy (which is carbed)
The filler *HAS* to be external, so that if the gas in the tank expands (when hot) and vents, it will vent to the outside world, not into the car gassing all the occupants and making a big explosive cloud in there...
So long as the fuel pump has on overflow/return to tank pipe (and I'm pretty sure it will!?), then there is a 'petrol shut off' solenoid which sits inbetween the fuel pump and carb in the fuel line and shuts off when you switch over. This obviously leaves the fuel pump running but all the fuel is just pumped back to the tank.
I believe on carbs the switchover to gas is a 2 stage process - you switch the petrol off, let the float bowl drain and then switch to gas so as to prevent 'dual fuelling'. That said, most systems allow you to start on gas as I used to do in my Merc - never had any problems with the vapouriser freezing up, even in -5 degrees outside!
My carb knowledge is weak for LPG, but I believe the above to be true!
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dubzi
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You do need the 2 stage switchover otherwise it just stalls. Soon as it starts dying after switching the petrol off, flick it over to gas and off it goes.
I found that it was easier to use flexible plastic gas pipe (bought mine from Tinley Tech) as it's easier to route than copper. Still need to use the insulated pipe clips. Better to pop rivet them to the car rather than use screws. Less likely to work loose with vibration.
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Last Edit: Oct 5, 2011 8:41:47 GMT by dubzi
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ChasR
RR Helper
motivation
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Club RR Member Number: 170
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LPG ChasR
@chasr
Club Retro Rides Member 170
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I still prefer Copper pipe myself (at the end of the day, the car gets alot of curse word thrown at it underneath), but I do agree plastic is much easier to work with.
Yes, you can install an LPG conversion yourself. For insurance purposes it may be worth getting a certificate from an installer once you have fitted it yourself, and potentially get a tiny bit of tax back from your road tax.
I have ran cars straight on gas with no issues. As long as your coolant is good and the pipe runs are correct freezing should not present an issue.
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