Our volunteer fire department has a 1992 Pierce Dash pumper with a 6V92TA, 350HP engine and a HD755DR transmission. We started having a surging issue while under loaded throttle up. engine fires right up every time with no problems. When we get above 35 mph the engine loses power and starts surging. This truck only has 4000 miles and close to 200 hours on it. We started by checking the obvious fuel and air filters. changed all. Then we thought with age maybe the fuel lines were collapsing under load.

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