Detroit Diesel — Fuel Flow Test
Testing & diagnosis · Fuel system
From a Detroit Diesel service manual — check it applies to your exact model before use.
Procedure
- Disconnect the fuel return hose from the fitting at the fuel tank and hold the open end in a container.
- Start and run the engine at 1200 rpm and measure the fuel flow for one minute.
- At least .6 gallon of fuel should flow from the return hose per minute.
- Immerse the end of the hose in the fuel; air bubbles indicate air being drawn in on the suction side.
- If air is present, tighten all fuel line connections between the fuel tank and the fuel pump.
- If flow is below specification, service the fuel strainer, filter or pump.
Specs & values
- At least 0.6 gallon per minute at 1200 rpm
Source: Detroit Diesel service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.