What are the consequences of excessive fuel pump pressure?
2 Answers
Excessive fuel pump pressure can disrupt normal lubrication conditions, such as increased oil viscosity, deterioration and gumming, clogged filters and oil passages, etc. Here are the relevant details:1. Function: Gasoline serves to cool and lubricate the fuel pump. Failing to refuel promptly after the fuel warning light comes on can reduce the cooling and lubrication effects, leading to potential damage.2. Fuel Quality: Impurities in low-quality gasoline can clog the fuel supply system and cause wear and tear on the fuel pump, leading to damage. Early failure of the fuel pump is often due to the use of substandard fuel in the vehicle.3. Electric Pump: Electric fuel pumps, which are not driven by the camshaft but rely on electromagnetic force to repeatedly actuate the pump diaphragm, can be freely positioned during installation and help prevent vapor lock.
A few days ago I just finished repairing a car, the issue of excessive fuel pump pressure was quite serious. Too high pressure can burst fuel lines or damage seals, fuel leakage not only wastes money but also dirties the engine bay, even posing a fire risk. The fuel injectors can also be damaged because they have to inject more fuel, causing the air-fuel mixture to become too rich, making the engine shake, with weak acceleration and unstable idle, making driving very uncomfortable. Prolonged conditions like this can flood the spark plugs, making ignition difficult, and in severe cases, the engine may stall or even be ruined. Normal fuel pressure should be between 2.5 to 4.5 bar, excessive pressure is often due to a faulty fuel pump regulator or a clogged filter, delaying inspection can lead to expensive repairs. I recommend using a fuel pressure gauge during regular maintenance checks, safe driving is the most important.
