I checked the fuel pressure today at idle it was 33 psi. When I shut off the engine the pressure went down to 5 psi in an hours.
i shut of the engine and unhooked the robber return line to the fuel tank of the fuel pressure regulator. It was not bleeding fuel however the pressure was going down.
what could be the problem fuel injectors or fuel pump and how can I check fuel injector if they leaks?
Fuel pressure should be 30-37 w/vacuum connected and 38-46 w/o. A 5 psi pressure drop within an hour is normal. Nothing to be concerned about. These pumps either work or they don't
June, 8, 2014 AT 2:03 PM
The pressure dropped to 5 psi in an hour. From 33 psi to 5 psi
June, 8, 2014 AT 3:34 PM
So how much did it drop in 5 minutes or 10 minutes? If it's within 10 lbs it should be ok otherwise check pressure regulator.
June, 8, 2014 AT 4:35 PM
I did the test yesterday and this are the result
- fuel pressure at idle and vacuum hose of the fuel pressure regulator connected 33Psi
- fuel pressure at idle and vacuum hose of the fuel pressure regulator disconnected 42 Psi
after that I turned off the engine and reported the pressure the result was
at 4: 36 pm the pressure was 33 psi
at 4: 41 pm the pressure was 29 psi
at 4: 44 pm the pressure was 28 psi
at 4: 57 pm the pressure was 26 psi
at 5: 13 pm the pressure was 16 psi
at 5: 18 pm the pressure was 14 psi
at 5: 25 pm the pressure was 8 psi
at 5: 37 pm the pressure was 5 psi
the next day the pressure was 0 Psi
the fuel pressure regulator is good it does not let fuel goes back to the tank when the engine is off
June, 8, 2014 AT 4:36 PM
Everything there is normal
June, 8, 2014 AT 4:57 PM
How long should fuel pressure remain in rail after shut down?
June, 9, 2014 AT 6:34 AM
There is nothing wrong with your fuel system I have no further comments and I gave you the answer previously
June, 9, 2014 AT 8:43 AM
I m asking because the car long crank when it seat for long time and I m asking because I want to learn