bad idle when the fuel tank is half or less

[torontovka]

Hi guys,


I noticed when my fuel tank is half or less the car idle very rough and bad and the RPM keeps going up and down.. this issue goes when the tank is more than half or full..

one more issue the fuel guage when the tank is full it shows only half..

what Do i have to check


regards

[tylang10]

Hi,

Had a similar problem with my MkII GTi found it was the tank fuel pump, this is in the boot, right hand side held in by a circular plate. What I can remember cost about £25 from GSF. fairly easy to fit, be aware of the fuel fume when you do it!! As far as the fuel gauge. sticky float arm or possible wire broken on the wiper coil?
Cheers Terry

Should have said it's called a 'tank lift pump'

[roar]

This could also be the uptake pipe out of the tank. I had an issue on a mark 1 golf where the pipe got clogged and unless the tank was nearly full it would stall the engine through lack of fuel.