Hints and Tips : Rover engine management problems Hints and Tips: Rover engine management problems Fuel leak at hose and fuel pump connection Range: Rover 75 - all diesel engines. Problem: Fuel leaking from the fuel hose at it's connection with the fuel pump Cause: The hose is not the correct size for clamp and this results in fuel leaking out. Action: Replace the hose and clip with replacement parts. Hose part number : WJH110440 Clip : ESR3501A Engine knock - fuel lift pump Range: 825 diesel Problem: While travelling at low speeds a knocking noise can be heard from engine Cause: Fuel lift pump internal valve failure. Action: You can test the fuel lift pump by pressing down on the lift pump priming lever. You can hear the knocking noise now if the pump has failed. Replace the pump to eliminate the noise. Loss of power - air intake hose Range: All old 825's and some new ones. Problem: Loss of power Cause: Under high vacuum pressure the hose between the turbo charger and the air cleaner can collapse. Action: Fit an improved hose, part number PHD10056 L-series diesel Erratic engine speed. Problem: Erratic engine speed. Can feel engine pulling against braking while slowing down. Revs remain high when foot is put on clutch and car has come to a stop. Revs hang up between gear changes Cause: Throttle potentiometer reading high due to incorrect throttle pedal idle stop position. Action: To test, keep your foot on the brake and rev engine above 1200 revs. If you take your foot off the accelerator and the revs do not drop until you take your foot off the brake then condition can be confirmed. Most likely cause is the throttle pedal stop pad. You can test the voltage returned by the throttle poteniometer by connecting a digital multimeter. If the multimeter voltage is greater the 540 millivolts when closed then you can try making the pedal stop pad thinner. If you remove the pedal stop and the voltage remains higher then the throttle may be binding.