Help!!! Code P0172 popped up!!!

[1955moose]

I agree, usually when a fuel regulator goes bad, they leak, or injection gets an extremely rich condition. Happened to a friend on his ford ranger. Fuel pump reading needs to be above 30 pounds. 35 to 40 is the norm.


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[1955moose]

You will need to check output pressure of both fuel pressure regulator, and fuel pump.


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[Nelson_00'_Expy]

He gave me options between those two. But now that you guys mention it, he never gave me a pressure reading

 

[1955moose]

Pumps usually go out before regulators due to heat. If you have a habit of running your tank low, theirs nothing to cool the pump. Fuel works like a kinda cooling for the pump. That's why I always try to school friends and customers, don't drop below 1/4 tank, you heat up the pump and suck gunk from bottom of fuel tank. This can clog filter and injectors .Have him test both parts. It's your dime!


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[Nelson_00'_Expy]

Will do and i'll update as soon as I can

 

[1955moose]

Keep us updated, it helps other members.


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[98eb5.4]

delete - wrong thread :

 

[1955moose]

I think 98eb5.4 is on the wrong thread. This one is about fuel pump/ fuel pressure regulator.


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[Nelson_00'_Expy]

So i just finished the fuel pressure test. With the key on engine off ot had around 5 psi and went down to 0 psi. When i started the truck it read 80 psi!!! And when i took off the vaccum line it was 83 psi. Is ot the fuel pump or the fuel pressure regulator?

 

[Nelson_00'_Expy]

Here is a video of the pressure


https://youtu.be/8W9VqPOd9nE