Cat 3406E blew the fuel filter off

Had a series 60 with a bad pressure relief valve. Didn't detonate like yours did but spun the filter almost completely off.

 

Attached the diagram. Pressure regulating valve is #26 P/N 282-1915. Should be around $50.00. Your return line would be the front hose #30 is from cylinder head. You could also have a plugged up ECM cooling plate. Fuel returns to tank @ fuel junction out hose on bottom right corner.

 

Just use your hand primer pump and see where your blockage is.

 

Make sure to get a O-ring for the valve.

 

That pressure valve is different than mine. It’s much larger. Also is the fuel passing through the filter housing to the ecm block then out to the tank? If so I blew through the block, it’s clear but the hose that’s on the upper front of the ecm block going behind the back of the engine wouldn’t let air pass through. Is that correct that the fuel flow?

 

Low Pressure Fuel Supply Circuit
The flow of fuel through the system begins at fuel tank (13). Fuel is pulled from the tank by fuel transfer pump (10). The fuel transfer pump incorporates a check valve (12) that will allow fuel to flow around the gears of the pump during hand priming of the fuel system. The fuel transfer pump also incorporates a pressure relief valve (11). The pressure relief valve is used in order to protect the fuel system from extreme pressure.

The fuel transfer pump is engineered in order to produce an excess fuel flow throughout the fuel system. The excess fuel flow is used by the system to cool the fuel system components. The excess fuel flow also purges any air from the fuel system during operation. Air that can become trapped in the fuel system can cause cavitation that may damage the components of the unit injector.

The fuel travels from the fuel transfer pump to distribution block (8). A fuel temperature sensor (9) that is installed in the distribution block is used to sample the fuel temperature. A signal that represents the fuel temperature is sent to the electronic control module (ECM) for processing.

The fuel is then pumped in to the fuel filter base. In most applications, fuel priming pump (7) is located on the fuel filter base. The fuel filter base also incorporates a siphon break that prevents fuel from draining from the fuel system when the engine is not in operation. The priming pump utilizes a series of check valves in order to direct the flow of fuel during the priming pump's operation. The check valves work with the fuel priming pump in order to produce a pumping action. The check valves also prevent fuel from being forced back into the fuel transfer pump. The fuel flows through a two micron fuel filter (6). The filtered fuel then flows out of the fuel filter base.

If a fuel cooled ECM is installed on the engine, the fuel is pumped into the ECM. The fuel travels through the cored passages of the electronic control module housing in order to cool the control module's electronics.

The fuel is transfered by fuel supply lines (1) to fuel gallery (3) in the cylinder head or to fuel manifold (3). Only a portion of the fuel that is supplied to the fuel injectors is used for engine operation.

The fuel that is unused by the engine is provided for cooling purposes. This unused fuel is discharged into the return passages of the fuel gallery. The fuel is returned to the fuel tank by the fuel return lines. A
continuous flow of fuel is experienced within the low pressure fuel system.

During engine operation, fuel injectors (2) receive fuel from the low pressure fuel system. The injector pressurizes the fuel to high pressure. The fuel is then injected into the cylinder. The excess fuel is returned to the tank. Refer to Systems Operation, "Unit Injector" for a complete explanation of the injection process.

A pressure regulating valve (5) is located in the fuel return. The pressure regulating valve allows the low pressure fuel system to maintain a constant pressure. A flow control orifice is also located in the fuel return. The flow control orifice maintains a system back pressure that is constant. The orifice allows the flow of fuel through the system to be constant. This prevents excessive heating of the fuel.

Straight from Cat.