Testing Bosch 237 fuel pressure regulator

[speedosack]

OK how do you test the functionality of a non-adjustable fuel pressure regulator when it's off the vehicle. I am trying to test a Bosch 237 regulator.

I tried:
1)80 psi pressurized air in the threaded fuel inlet, there was no flow to the fuel outlet
2)80 psi pressurized air in the fuel outlet, it pressurizes and I hear a pop sound from the diaphragm, still no air flow to the threaded fuel inlet
3)drew a vacuum on the vacuum port, regulator held a vacuum, no flow from fuel inlet to fuel outlet
4)30 psi pressurized air in the vacuum port, no flow from the fuel inlet to fuel outlet
5)drew a vacuum on the threaded fuel inlet, no flow through the fuel outlet
6)drew a vacuum on the fuel outlet, no flow through the threaded fuel inlet

does the metal fuel line that threads into the regulator fuel inlet somehow depress a check valve allowing operation? help please.

 

[A2000RICH]

OK how do you test the functionality of a non-adjustable fuel pressure regulator when it's off the vehicle. I am trying to test a Bosch 237 regulator.

I tried:
1)80 psi pressurized air in the threaded fuel inlet, there was no flow to the fuel outlet
2)80 psi pressurized air in the fuel outlet, it pressurizes and I hear a pop sound from the diaphragm, still no air flow to the threaded fuel inlet
3)drew a vacuum on the vacuum port, regulator held a vacuum, no flow from fuel inlet to fuel outlet
4)30 psi pressurized air in the vacuum port, no flow from the fuel inlet to fuel outlet
5)drew a vacuum on the threaded fuel inlet, no flow through the fuel outlet
6)drew a vacuum on the fuel outlet, no flow through the threaded fuel inlet

does the metal fuel line that threads into the regulator fuel inlet somehow depress a check valve allowing operation? help please.

the regulator is on the OUTPUT of the fuel rail-------the fuel flows into the port with the O ring and out the threaded connector-------with normal atmosphere on the top port (nothing connected) you should be able to apply compressed air to the side port with the O ring and when the pressure is above the set point of the regulator it will begin to flow out the threaded output on the bottom.-------80 Psi should open it pretty violently but from looking at your "test procedure" it appears that you might have damaged it from your first (#1) reverse test...........RC

 

[speedosack]

Thanks, these things are robust. I tested the spare 237 regulator. 70psi compressed air yields 58 psi out the threads. The regulator will not flow with less than 60psi compressed air.

Applying a vacuum to the port lowers the pressure. Applying pressure to the vacuum port closes the flow entirely.

 

[A2000RICH]

Thanks, these things are robust. I tested the spare 237 regulator. 70psi compressed air yields 58 psi out the threads. The regulator will not flow with less than 60psi compressed air.

Applying a vacuum to the port lowers the pressure. Applying pressure to the vacuum port closes the flow entirely.

i believe your pressure gauge on the output is a problem------i don't think this regulator is designed to work with the output port closed off----without a lot of difficulty it would be hard to to a full functional test with air ----all you can do is "see" if it flows...........RC