K2500 burb evap leak
Hi there. We have just acquired a new to us 2010 k2500 6L 6l90 3.7 burb. However with the gas cap tight and in good condition I keep getting a p0442 evap leak at ~750miles after erasing the code it r...
Forum Discussion
If the leak is bad enough you are smelling fuel, you are also losing MPGs because you are losing vacuum through that leak.
Often there is a soft elbow at the evap canister, and this is a common source of a large leak. But really, any of the vacuum fittings can fail, and sometimes rodents decide it makes a tasty snack.
The cheap way to pinpoint is to use a vacuum pump with gauge, and isolate each branch of the evap system. This can be time consuming however. Shops usually use a smoke machine to find the leak quickly.
Also, check the fuel filler hoses, including the crossover hose. Those can crack, and besides being an evap leak, could slosh fuel out.
Often there is a soft elbow at the evap canister, and this is a common source of a large leak. But really, any of the vacuum fittings can fail, and sometimes rodents decide it makes a tasty snack.
The cheap way to pinpoint is to use a vacuum pump with gauge, and isolate each branch of the evap system. This can be time consuming however. Shops usually use a smoke machine to find the leak quickly.
Also, check the fuel filler hoses, including the crossover hose. Those can crack, and besides being an evap leak, could slosh fuel out.
