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Showing results for tags 'hesco '.
Hi Moses, So I have the 4.0L head on the 258 block, with the Mopar/Hesco MPI kit installed. I love it, except for the vapor lock problem, and that the gas mileage still seems poor (14.5mpg) MILEAGE AND HEAT I experience vapor lock after long drives on hot days and/or going up mountains. There is a pressure and return line running up the driver side, where the exhaust is also located. External fuel pump mount near the exhaust pipe on drivers side of the rear cross member, filter also on cross member in center of vehicle. I tried wrapping the exhaust from manifold, over cat conv a