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You would waste a good amount of fuel through the valve overlap at the intake stroke, not to mention the intake manifold may freeze like it used to happen in a Canadian Corolla fitted with the 7A-FE engine which an uncle of mine used to own and had it fitted with a CNG fumigation setup. As LPG is stored in liquid phase, unlike CNG which is stored in vapour phase, the temperature drop while it switches from liquid to vapour tends to be more intense. I'd rather try some of those multi-port sequential injection kits often used for both CNG and LPG conversions instead of fumigation in any vehicle originally fitted with sequential MPFI.
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