What does a check valve on a fuel pump do?
Check Valve Operation: The electric fuel pump outlet contains a one-way check valve to prevent fuel flow back into the tank and to maintain fuel supply line pressure (engine warm) when pump is not operational.
What to do if your fuel pump won’t start?
When the electric immediately (1–2 seconds) rise to specification. ² Fuel pressure bleeding past a fuel injector (s). the fuel pump module. (1) Disconnect the fuel inlet line at fuel rail. Refer to Fuel Tubes/Lines/Hoses and Clamps for procedures. may be necessary before fuel line disconnection. Tool Hose. Tool number 6539 is used for 5/16” fuel
What should the fuel pressure be in a jeep?
Normal operating pressure should be 339 kPa +/–34 kPa (49.2 psi +/–5 psi). (7) Shut engine off. minutes. fuel pump module, or a fuel tube/line is leaking. temperature. (11) Shut engine off. Adapter Tool. If pressure now holds at or above 30 psi, a fuel injector or the fuel rail is leaking. Adapter Tool. If pressure now holds at or above 30
Is there a leak in the fuel lines?
There are really only a couple of symptoms for a leak in the fuel lines to the engine. Either the engine randomly runs out of fuel and dies. After turning the engine off and letting it sit for a couple minutes, you have to prime the primer bulb up again.
What happens when the fuel pump goes out in a Jeep Wrangler?
There are physical signs that you can feel when your Wrangler’s fuel pump is going out. Before taking anything apart, check to see if your engine’s computer has any trouble codes saved in it. The engine may throw a P0087 trouble code. This trouble code detects that the fuel rail/system pressure is too low.
What causes a fuel pump to stop working?
If pressure now holds at or above 30 psi, a fuel injector or the fuel rail is leaking. Adapter Tool. If pressure now holds at or above 30 psi, a leak may be found at a fuel tube/line. If no regulator may be leaking. defective check valve in the filter/regulator. A slow valve in the electric fuel pump.
Check Valve Operation: The electric fuel pump outlet contains a one-way check valve to prevent fuel flow back into the tank and to maintain fuel supply line pressure (engine warm) when pump is not operational.
How can I tell if my fuel pump is working?
The only way to truly tell is to place a fuel pressure gauge on both sides of the line and get a reading from both. If your car isn’t starting at all, and you hear the fuel pump prime that is usually a good indication that the pump is working to some capacity.