Vauxhall combo LPG dual fuel

[archeraddict]

It is a W reg and runs fine on petrol, but is only firing on 3 cylinders on LPG. It is still more economical to run it on LPG and as I paid very little for and am just using it very locally as a bit of a work horse, I don't mind the poor performance. However, am I at risk of ruining the engine if I continue to run it on LPG. If I'm going for a longer run, then I switch to petrol. Thanks for any advice.

[AlBags]

I did LPG design/build several years ago .. and a member of LPGA.
Is it original Vauxhall build?
Do you know what make the lpg add-on kit is? AG .. Vialle .. ?
If electronic injectors, one has probably failed. This type are solenoid driven.

[archeraddict]

A^lBags - Sorry for delay in replying - busy weekend! It is an original Vauxhall build, not a conversion. I mainly want to know if I will damage the engine etc. if I continue to drive it on LPG. The Van isn't worth much and I bought it thinking that I would really get the purchase price back in a year or so on the fuel savings. However, I don't want to end up ruining it completely to save a few pennies! Thanks for your help