Assalam o Alaikum!
I am facing this weird problem in my car. It started from last week b4 that it was working normal. I bought this car brand new in 2010. Last week I fueled it to full with auto stop. Then I started my travel from Pindi to Lhr. The fuel gauge needle went to half as normal then stuck their for sometime and after that it starting to going upwards and stopped at 'F'. I was keeping an eye on it but couldnt do anything. Then in the morning I opened the fuel cap and there was a sound like opening a 1.5ltr carbonated drink. Means pressure was built in the tank. Anyway I closed the cap and started the car and after doing some 1,2 km the needle become normal and it started working perfectly.
When the tank went to 1/4 i refueled it to full (Auto Stop) and travelled from Lahore to Bahawalpur. and same happened again like after reaching to half it started to go up again until at 'F'. I did the same jugaar and it worked this time again. But this time even without refueling the needle starting to rise again and now its completely stuck at full "F". I did opening the fuel cap and closing again the pressure is built up everytime i drive and it releases when i open the fuel cap but now the needle is not coming down.
I have read on internet that it can be a malfunction of EVAP system. I disassemble the charcoal canister from the car it has 3 lines . 1 from Tank 1 to Engine 1 is exaust. I vaccum it with mouth and it was working fine means 'ek side se phook maro to baki 2 wholes se nikal jati hai'. KIndly someone help me how to check purge valve operation by myself. and any other thing i can test at home before getting it checked by some mechanic.
Its a long thread if you have time u can read it or the brief of the thread is
"fuel tank mein pressure built up ho raha hai or fuel gauge ki needle F per stuck ho gai hai, ab purge valve ya koi or solenoid hota hai woh check kerna hai,and there is no engine check light"
Thanks in Advance Shukria JazakAllah