- Location
- Scottish Highlands
My 390 just stopped while turning hay. I bled the fuel system and started off again. Then it stopped again. The fuel lift pump was totally choked with crud. It was amazing that it was working at all. I replaced it with a new one, also replaced the fuel filter. But I haven't been able to get any life out of it since. I haven't had the fuel tank off to clean it as I can't get the large bolts to the nose undone so I have repeatedly drained and refilled the tank, filtering the fuel in between. Everything is now sparkling clean. But no improvement. I can get clean fuel to the lift pump but working the external leaver doesn't move fuel through the pump. The lift leaver doesn't feel right. I'd expect to feel some resistance and for the lever to return by itself -- but I have to lift it with my finger. No fuel comes out the other side going to the fuel filters. I've worked that leaver over 200 times without moving any fuel beyond the pump. There's a blockage somewhere, but where? I got the old pump working and have tried that, but the symptoms are exactly the same. I've been advised that the internal leaver of the pump isn't resting on the cam free area of the crank shaft and to turn the engine. I've done that (several times) but there is still no change. Is there a filter in the injection pump? But that can't be it either or fuel would be getting past the lift pump.