Re: VW Golf Year 2000 1.8 20 Valve Turbo AGU Poor Performance Archived Message
Posted by Sean Mc Gettigan on June 10, 2008, 1:08 am, in reply to "Re: VW Golf Year 2000 1.8 20 Valve Turbo AGU Poor Performance"
Hi Phil,it can happen a few differant ways.The easiest one to explain is air in the fuel as the swirl pot level drops.I've seen this with in-tank pumps that are drawing air in through the pump housing,ok when the level is covering the fracture in the housing but once the car is driven + the level in the swirl pot drops the pump draws an air/fuel mix in,the pressure is ok but its pressurised air/fuel in the system not just fuel (ps it you ever open a system like this you can tell right away,it sprays out under what seems like much too high a pressure + for much longer + will get the eyes!).The injector opens and a mix of air/fuel is injected = lean. The other thing that can happen is a very low + dropping flow but the pressure remains the same,think of it like volts(pressure) + amps(current flow),you can have a circuit that requires 12v + 6 amps but it only has 12v + 2 amps,you have 12 volts in both cases but @ 2 amps the system will not work correctly. Until I saw it myself I couldn't get my head around it either,once you see it once you'll never use any other fuel test equipment but coda again.There are examples(+ better explainations) of this in the archives but too late to dig them out now. Gettin late,hope that made sense Sean
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