Use this test in combination with pressure test the fuel pump and the fuel capacity Test. check valve pump operation: the electric fuel pump outlet contains a one-way valve to prevent fuel flow back into the tank and to maintain fuel supply line pressure (engine warm) when the pump is not working. It is also used to keep the fuel supply line, full of gasoline when the pump is not working. After the vehicle has cooled down, the fuel pressure may drop to 0 psi (cold fluid contracts), but liquid gasoline will remain in the fuel supply line between the check valve and fuel injectors. Fuel pressure, which dropped to 0 psi on a cooled down vehicle (engine off) is a normal condition.
Where is the electric fuel pump, fuel pressure should immediately (1-2 seconds) rise to specification. Abnormally long periods of cranking to restart a warm engine, which was closed for a short period of time can be caused by: fuel pressure, bleeding in the past, injector (s). Fuel pressure, bleeding in the past, the valve in the fuel pump module. 1. disconnect the fuel line at the fuel rail. Refer to fuel tubes/lines/hoses and clamps for procedures. On some engines cleaner housing air removal may be required before the fuel line separation. 2. get the right fuel line pressure test hose tool adapter. Tool number 6539 is used for 5/16 "tubing and tool room 6631 is used for 3/8 fuel lines. Fig. 7 connect the adapter tool (typical) 3. Connect the correct fuel line pressure test hose between tool adapter disconnected fuel line and fuel rail (fig. 7). 4. connect 0-414 kPa (0-60 psi) test fuel pressure gauges (gauge set 5069) to test for the appropriate adapter tool. DRB III Scan Tool together with the PEP module pressure 500 psi port adapter and sensor test can also used instead of the fuel pressure sensor.
2000 Dodge RAM 1500 Van fuel leak down pressure test Download
