I'm doing quite a considerable mileage so with LPG around 65p per litre versus at least £1.30 for petrol I'm thinking about doing a conversion.

If I do the conversion, a liquid phase injection system looks the best bet. LPG is not evaporated to a gas, but injected as a liquid via a pump in the gas tank. It's chilling effect (heat of evaporation) cools the inlet airflow so performance is excellent and there's a lot less "stuff" to install. But the injectors require the inlet manifold to be drilled so some major parts have to come off the car to do the job.

My question is how hard is it to remove the inlet manifold? On some Fiats it has to come off along with the cylinder head, so I really don't want to discover that the hard way.

Can't help with regards to the work
But I'm sure it would help others if they knew what engine you have

chris3234 said:

Can't help with regards to the work
But I'm sure it would help others if they knew what engine you have

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Oops A very good point that I'd intended to put in the title.

It's a 100HP with the 1.4 engine.


Getting a close look - it "looks" like there's enough space to remove the inlet manifold but I thought the same about the 1746cc Punto HGT and that was definitely a head-off job to remove the inlet manifold.

Hi Dave

Not sure if you had a chance to yank off that Intake yet but I just did mine and it went pretty smooth.

Disconnect negative from battery
Remove airbox
Disconnect map sensor
Remove evap easy connector on the left
Release pressure from fuel rail and disconnect fuel feed easy connector
Disconnect air intake at the throttle body and undo the 4 size 10 e sockets holding the engine ecu and throttle body. Disconnect connector to TB, engine ECU and evap cannister. Also disconnect the connector for the injector harness.
Remove brake booster vacuum. Take care not to brake off the plastic pipe to intake. They snap off easily. Best way is to undo the clamp and with a screw driver and pulling directly in the direction of the pipe gently ease it off. Same with the opposite side with the breather hose from the valve cover.
Next start undoing the bolts for the intake. Ps it a a massive pain in the ass to get to but be patient, make sure the car is cold. I managed to get to all of the bolts without doing removing alternator and a.c.

I used 1/4 inch and 3/8s with a size 11 socket and both extensions as well as a swivel. Make sure you remove all the bolts before starting to wiggle it out. I left the bolt in on the valve cover to keep it in place until I was ready to take it off. This keeps pressure of the manifold bolts to make them easier to remove

Side note, have coolant n hand for reassembly as the I take blocks off a water port. I used a little silica.e around the oring to ensure its not going to seep out.

Use a mirror to make sure you get all of the bottom bolts!

Also maybe a good idea to replace the orange I take seals.

Good luck!
Ps thanks for all the help and info on my build

Thanks for this. I've got the job on hold for now but will post details if I do get LPG fitted to the car.



PS. I find it's always best to first remove the most difficult bolts. If any are impossible or time is running out, its less work to put it back together. I leave the easiest to last as it often gives me a free hand to hold the "whatever" as the final fastener comes off.

PPS Liquid phase LPG injection systems cost a little more, but do not compromise power and give better mpg than vapour phase systems.

DaveMcT said:

I find it's always best to first remove the most difficult bolts.

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Good advice for any job.

Sometimes I'll do this in advance.

When I take delivery of a new car, I generally remove, lubricate & refit anything I think I'll need to replace during its lifetime. This can take the best part of a day, but saves an awful lot of frustration later.