fuel pressure?

1996 HONDA ACCORD
239,000 MILES • 2.2L • 4 CYL • FWD • AUTOMATIC
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ZEMORZEMOR
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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?
Jun 7, 2014 at 8:25 PM
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HMAC300
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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
Jun 8, 2014 at 8:03 AM
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ZEMORZEMOR
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the pressure dropped to 5 psi in an hour.from 33 psi to 5 psi
Jun 8, 2014 at 2:03 PM
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HMAC300
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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.
Jun 8, 2014 at 3:34 PM
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ZEMORZEMOR
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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
Jun 8, 2014 at 4:35 PM
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HMAC300
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It sounds like you have a fuel pump that is going out.
Jun 8, 2014 at 4:36 PM