WHERE IS THE CHECK VALVE ON A 2004 ASTRO VAN TO CHECK FUEL PUMP PRESSURE?

Our professional auto technician provides a good answer.

Jeff Armer Oct 02, 2023

You could try turning the key on an off a few times (without trying to start it ) to pressure up the fuel lines. There is a check valve in fuel pump module inside the fuel tank that is suppose to keep fuel in the lines an fuel injector rail. It's probably bad.

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Could be low fuel pressure. Should be 50psi min.

Fuel Pump check valve

Check Pressure at motor with
a gauge-- to see if it holds when engine
is off

You might be getting fuel to the rail, but are you getting enough? Double check the installation and make sure you didn't kink the fuel lines when putting the tank back in. This could cause a reduced fuel flow resulting in a no-start condition.

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#1 NEED TO VERIFY SPARK AT SPARK PLUGS # 2 CK FUEL PRESSURE AT SCHRADER VALVE ON FUEL RAIL ,,PRESSURE DEPENDS ON TYPE ENGINE ....IF NO SPARK AT SPARK PLUGS CHECK SPARK FROM COIL WIRE , IF NO SPARK AT COIL ,CHECK VOLTAGE TO IGNITION COIL SHOULD BE 12 VOLTS, IF NO VOLTAGE AT COIL ( KEY ON ) CHECK FUSES THEN IGHITION SWITCH. IF NO FUEL PRESSURE AND FUEL PUMP RUNS REPLACE PUMP .. CK VOLTAGE TO FUEL PUMP WHILE CRANKING . CK USING PUMP GROUND WIRE AT THE PUMP CONNECTOR THIS WILL PROVE GROUND ALSO. USE TEST LIGHT TO VERIFY

You need to check fuel pressure. Fuel pump may be working but weak.

Open the hood ,remove the air box for the engine but leave the mass air flow sensor on.Get some carb cleaner and spray it in the air intake tube while someone tries to start the van and if it fires and runs on the cleaner it is defanetly a fuel issue and most likely the fuel pump.If you have a fuel pressure gague you can remove the engine cover inside the van and connect to the fuel pressure port to see what u have for fuel pressure which should be between 55-65 psi to run.

How do you know the fuel pump is good? And I would not keep using starting fluid to try and start the vehicle. Did you check fuel pressure? Did you try to dump a little fuel down the carb then try starting?

check the fuel pressure regulator and also the emc fuse

more than likely