I have a problem with my 1991 Mk2 GTI 8v. After riding for a while with my GTI when I'm low of fuel (less than 1/4, but without getting to the reserve) there's a point when the engine stalls and I can't turn it on until 10-15 minutes. Usually before the engine starts to show symptoms of stalling I can hear a very noisy sound that looks to come from one of the fuel pumps.
Also when the engine gets hot at normal temperature and I want to accelerate fast the throttle does not response, it does nothing for some seconds (but 10 or more seconds, sometimes it works one second yes, one not, one yes... for a time) until it "works" again.
I cleaned the ISV, replaced spark plugs, distributor cap and distributor rotor which where in bad condition, but it didn't fix the problem.
What it can be?
Thanks for your help.