I did a number of LPG and CNG conversions before I moved from BC to WA (after my accident) and my Jtruck will be a stroker Jeep 6 with LPG soon (11:1 compression to take advantage of the 120 octane) The engines wore out on those pumps because the 2.3L was a poorly self oiling engine. Mohawk came up with an oil additive (that's when zinc was added) to counteract the drying effect of CNG and LPG. Taxis had 300,000 plus miles between motor changes.