Diagnostics

For detailed diagnotic instructions for DAVCO Fuel Processors, follow these links:

Diagnostic Documents (in pdf format)
Air Bubbles vs. Vapor Bubbles	1318
Heater Testing	3134
Cold Weather Operations	3506
Diagnostics with the Clear Cover	3097
Test Procedures for Fuel Processors with Clear Covers	3089
Fuel Filter Performance	3507
Check Valve Service	1083

If you are not able to determine the cause from these documents, please contact customer service for further assistance.