leigha 0 Posted February 17, 2007 the fuel pump has always been noisy on our corrado but has always worked ok. the other day we ran out of fuel, though the gauge was still not in the red but it has run out like this before. i'm fairly confident this was an empty tank as i heard the sickening fuel pump scream when it chugged to a stop (outside house luckily enough!!!) after a refill, all was well for 2 days when it has now conked out. the fuel pump used to make a loud whirring noise when priming, now it just makes a quick 'grunt' if anything!!! i suspect the fuel injection pump has been finished off by some crap from the dregs of the tank but as i'm new to VW's , can anyone else confirm this? could it be the lifter pump or fuel filter possibly? cheers! Quote Share this post Link to post Share on other sites
87 Jetta 16v 0 Posted February 17, 2007 If there is no noise of the pump running on the turn of the key it is unlikely to be strainer clogged or the fuel filter...it doesn't sound good :( Quote Share this post Link to post Share on other sites
CorradoVR6-Turbo 0 Posted February 17, 2007 There is two pumps on the your car,best make sure the lift pump in the tank has not packed up,as for the one under your car if its been starved of fuel it could have siezed up. Quote Share this post Link to post Share on other sites
leigha 0 Posted February 17, 2007 ok, cheers to test the lifter and injection pumps, if i disconnect the supply lines from both (individually) and switch the ignition on, it should throw out fuel in an attempt to reach the right operating pressure, right? does anyone know what operating pressure the injection pump needs to run at? i may have to get my husband to cobble something together for a while as ideally i need to use the car to get me to work, my husband to work and the kids to 2 seperate schools all week! sods law that this happened after a half term week where only my husband was doing anything each day! regarding replacements, i've briefly searched the GSF website part numbers for matches and some 8v mk2 golfs and the 16v mk2 golf seem to have the same injection pump, is there any other cars that i can scour the breakers for that would have a pump that works? my bro-in-law thinks he still has an injection pump from a mk3 polo coupe gt lurking, though the part number is different on the gsf site. however i can't see what the actual differences are! argh! Quote Share this post Link to post Share on other sites
CorradoVR6-Turbo 0 Posted February 18, 2007 All the VW 16v 8v uses the same range of pumps so look at golfs,jetta's ect dont know about the polo.Do as you have said unplug the main pressure pump,power up the lift pump and see if it pulls fuel up and out.If it does and is getting down to the pressure pump with no problems power up them both but to be fair if it was noisy before its probably given up by now. Quote Share this post Link to post Share on other sites
RS VR6 0 Posted February 18, 2007 http://www.corrado-club.ca/mods/vr6_fp_test.html http://forums.vwvortex.com/zerothread?id=3069910 Quote Share this post Link to post Share on other sites
CorradoVR6-Turbo 0 Posted February 18, 2007 Thats tests for a VR6,and if you had a fuel pressure test kit would be nice. Quote Share this post Link to post Share on other sites
leigha 0 Posted February 18, 2007 on the subject of temporary cobbling together of another pump, i've just had a look at the specs for the bmw fuel pumps i have and they both operate at 2.5 - 3 bar. according to the golf haynes manual, the injected cars need nearer 4.5 - 5 bar. that's that one out then! all hopes are now pinned on the polo one. this is all doubly annoying as it died aboout an hour after all the breakers yards and motor factors near me closed on saturday and i need the car all next week! once the in-laws have left (soon hopefully!), it's time to start pulling the thing apart to see the score.... Quote Share this post Link to post Share on other sites
leigha 0 Posted February 18, 2007 no news on the polo fuel pump yet as my bro has been out but i can now confirm that the lifter pump is fine and the injection pump is totally stuffed! it's actually siezed internally due to massive wear! (had to open it up out of curiosity!) the bmw ones are actually very similar but not the same physical size and then also not the right pressure rating. the wear on the old pump has me wondering though... with the wear that was present, i wouldn't be at all suprised if the operating pressure was seriousl reduced. at this reduced pressure the spray pattern from the injectros could have been really bad (dribbley!?) which could explain the mysterously poor fuel economy this car has suffered from...? Quote Share this post Link to post Share on other sites
