WH 5.7 litre Hard starting after filling tank

[Shovelhead]

My Brother has a WH Stato 5.7 litre. After filling it with fuel (to the first click on the bowser) when he goes to start it up it won't fire and winds over erratically. Then on trying again the engine starts but runs rough for a few seconds then smooths out. After this it starts first time every time hot or cold. This only occurs after filling with fuel. Has anybody else experienced this problem? Any info would be appreciated. Cheerz Rick

 

[statey1975]

My first suggestion would be to replace the fuel filter - probably full of crud....

 

[Pollushon]

There's been a few cases of a bung purge valve in the charcoal canister resulting in a similar issue.