What should I do if my fuel pressure is high?
What should I do if my fuel pressure is high?
Start the engine; the fuel pressure should remain the same. Snap the throttle and make sure it increases. This an indication of a good fuel pump. Test a vacuum operated fuel pressure regulator’s operation by removing the vacuum line while monitoring fuel pressure. The pressure should increase (5-15 psi.).
Why do I think my fuel pump pressure is good?
All too often, technicians assume fuel pressure is “good” without actually measuring it with a gauge. If the engine runs, they assume the injectors are getting adequate fuel pressure. If the engine cranks but won’t start, and they depress the service valve on the fuel rail and some fuel squirts out, they assume the injectors have pressure.
What happens when your fuel pressure is low?
Fuel Pressure. Proper fuel pressure is vital for engine operation and performance. Low fuel pressure results in a lack of horsepower, stalling, and a slow or no-start condition. A faulty fuel pump or a clogged fuel filter will result in lower than normal fuel pressure at the rail.
Can a change in fuel pressure cause driveability problems?
Fuel pressure is probably the most critical factor in the fuel injection system, so much so that only a 1 to 3 psi change in fuel pressure can often cause noticeable driveability problems. So, the first thing technicians should always check when confronted with a driveability or emissions problem is fuel pressure.
Start the engine; the fuel pressure should remain the same. Snap the throttle and make sure it increases. This an indication of a good fuel pump. Test a vacuum operated fuel pressure regulator’s operation by removing the vacuum line while monitoring fuel pressure. The pressure should increase (5-15 psi.).
All too often, technicians assume fuel pressure is “good” without actually measuring it with a gauge. If the engine runs, they assume the injectors are getting adequate fuel pressure. If the engine cranks but won’t start, and they depress the service valve on the fuel rail and some fuel squirts out, they assume the injectors have pressure.
Fuel pressure is probably the most critical factor in the fuel injection system, so much so that only a 1 to 3 psi change in fuel pressure can often cause noticeable driveability problems. So, the first thing technicians should always check when confronted with a driveability or emissions problem is fuel pressure.
Fuel Pressure. Proper fuel pressure is vital for engine operation and performance. Low fuel pressure results in a lack of horsepower, stalling, and a slow or no-start condition. A faulty fuel pump or a clogged fuel filter will result in lower than normal fuel pressure at the rail.
