Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
I CAN LOOK UP P440 AN HELP
ITS NORMALY HARD PLASTIC HOSE THAT IS NOT AT THE FUEL PUMP COVER ILL LOOK IT UP TO BE SURE
the three hoses are fuel pressure fuel return and vent. if the hose connection are good. the pressure sensor is that black round device with the two wire connector make sure it was not damage or left un pluged.if you have a scan tool you can see fuel tank pressure .the hose you want to test is the one that routs to the evap canister
OK, let me try this differently. The way you are describing things, I don't think we are on the same page maybe you should send me a diagram.
1. On a 2001 Jimmy fuel pump there are three connectors for three black hoses....of these three hoses, are any of them, if not corrected properly capable of causing the P440 code, and if so, which ones.
2. You referred to a pressure sensor...where is the pressure sensor? There are two wire harnesses which connect to the fuel pump, neither of which is a black round device, one is oval and one is square these are electrical connactions not devices...are you talking about these connections? and if so which one?
3. When you say the hose you want to test is the one which routs to the evaporation canister...what hose is that and how do I know it when I see it.
hi..this may help you..please print
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The evaporative leak detection diagnostic strategy is based on applying a vacuum to the EVAP system and monitoring the vacuum decay rate. The Vehicle Control Module (VCM) monitors the vacuum level via the fuel tank pressure sensor input. At an appropriate time, the EVAP purge solenoid and the EVAP vent solenoid turn ON, allowing the engine vacuum to draw a small vacuum on the entire evaporative emission system. If a sufficient vacuum level cannot be achieved, a large leak or an EVAP system malfunction is indicated. The following conditions can cause this problem:
Any of the above conditions can set a DTC P0440.CONDITIONS FOR RUNNING THE DTC
CONDITIONS FOR SETTING THE DTC The EVAP system is unable to generate a vacuum more than a calibrated value over a specified period of time.ACTION TAKEN WHEN THE DTC SETS
CONDITIONS FOR CLEARING THE MIL OR DTC
DIAGNOSTIC AIDS IMPORTANT: An accurate indication of fuel level is required for the VCM to properly pass or fail this DTC. Always diagnose fuel level sensor DTCs before performing this DTCs diagnostic table. Always check for fuel level sensor DTCs stored in history.Check for the following conditions:
Refer to Evaporative Emission (EVAP) System Cleaning before starting repairs. Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.