Hard Start... Where's the Fuel Tank Module?

Most European vehicles mount the fuel tank module in an accessible location; this means there is no time wasted to lower the fuel tank. Today’s Real Fix of the Day is an example of how to tackle a hard start situation.

2003, BMW 330i, 3.0

P0171, P0174, Hard Start, Replaced Fuel Tank Module

The customer states the check engine light is on and the vehicle exhibits a hard start.

Connected a scan tool and found codes: P0171 - System Too Lean (Bank 1) and P0174 - System Too Lean (Bank 2). Started the vehicle to confirm the customer's concern, and found the vehicle exhibited a hard start. Connected a smoke machine, induced smoke into the intake air system to check for leaks and found there were no leaks present. Connected a fuel pressure gauge, tested fuel pressure and found the fuel pressure was lower than the specified range of 3.5 +/- .02 BAR. Connected a multi-meter to the fuel tank module and checked for the presence of power and ground at the module. Testing verified the presence of both power and ground at the fuel tank module, which indicated the fuel tank module was defective.

Replaced the fuel tank module, cleared codes, performed a road test and verified the vehicle operated properly. The check engine light did not illuminate and no fault codes returned. The customer's concern did not return.

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