Frequently Asked Question

Cause :

1. The pressure sensor is old and needs to be replaced.
2. The pressure being sensed is fluctuating.

Troubleshooting:

1. The VDO type pressure sensor, when used to sense fuel pressure, has a lifespan of typically 200-500 hours. This is especially true with carburetor-equipped engines. When at the end of its life, it is typical for the sensor to be erratic with higher than actual readings being common.
2. If the sensor is less than 100 hours old, it is possible that the pressure is fluctuating, or the sensor is bad. The sensor can be replaced or another pressure gauge used to determine the cause.