"with roughly .9 gallons of fuel in tank, when leaving a full stop, vehicle pauses hard on acceleration. Probable cause is fuel starvation caused by fuel flowing back in the tank, away from the front-located fuel pump, starving efi system of gasoline. As fuel moves forward after a brief pause in forward momentum, the pump has access to the fuel and the bike suddenly lurches forward. This happens multiple times as the fuel in tank travels forward and aft. Extremely unsafe condition at low speeds, especially at intersections when this is most likely to occur."
2015 Harley-Davidson XG750 engine complaints
Page 2 of 2: complaints 11 to 13 of 13, newest first, as owners wrote them.
When the low fuel light comes on there is .9 gallon gas left in tank. The low fuel light comes on when approximately 2.8 gallons of gas has been used. When the low fuel light comes on and the throttle is applied the engine stalls until the throttle is released. When the throttle is released the engine goes back to idle. When the throttle is reapplied the engine stalls until the throttle is released. If the throttle is gently applied the engine may pickup speed. This has happened on dozens of occasions in various scenarios: a.) the worst situations have been when passing another vehicle and the low fuel light comes on and the engine stalls in front of the vehicle being passed. B.) the second worst situation is when the low fuel light comes on and the engine stalls when crossing an intersection - especially a four-way stop. C.) the third worst situation is when the low fuel light light comes on when turning a corner. This causes the vehicle loose forward momentum and to fall over in the direction of the turn - or it surges and causes the vehicle to "high-side" over on the opposite side of the turn. I mentioned this to the hd dealer during the first dealer check up (1000 mile). They claimed they could not duplicate the problem. If you review your records I believe you will find several other same type complaints for this vehicle. In some cases the dealers have replaced fuel pump, sock... In other cases the dealer and manufacture denies this problem exist. There is a hd xg750/500 forum that has dozens of similar complaints.
When fuel is low (usually below 1 gallon), the motorcycle behaves dangerously when accelerating from a stop. Vehicle will begin to move forward, suddenly lose power causing it to slow down, and suddenly regain power causing it to accelerate unexpectedly. Most likely cause is fuel pump starvation. Fuel pump is located at front of the tank, as vehicle moves forward the remaining gas is pushed to the rear of the tank, pump can't maintain fueling to fuel injectors, causing the bike to lose power and slow. The gas then moves forward, pump accesses the fuel and feeds the system causing a sudden and unexpected return of power and acceleration. At stoplights and stop signs this could easily result in the motorcycle being rear-ended, and in corners could easily cause the rear wheel to lose traction resulting in an accident.
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