Darkbound 7 Posted July 25, 2017 Report Share Posted July 25, 2017 (edited) Hey guys, I just replaced my fuel pump because it was driving me crazy with all that whining and I thought it was about time to sort this out. I purchased a brand new VDO fuel pump, installed it, turned the key on and..... it whined just like the old one!!!!!!!! You can hear in the video bellow how it whines. A few things to note: - I have no loss of pressure (both old and new pumps are holding steady 2.5 bar) - Fuel pressure regulator is working perfectly (unplugging vacuum brings pressure up to 3 bar as per specs) - My fuel tank is half full, so the whole fuel pump is submerged. - I have no noticeable loss in power when driving, infact car runs almost perfectly - Fuel filter has no more than 1k miles on it I just want to get rid of the whining!!! Edited September 21, 2017 by Darkbound Link to post Share on other sites
Darkbound 7 Posted July 27, 2017 Author Report Share Posted July 27, 2017 Found the problem and it was not in the pump, rather one of the hoses. I assume that this will only apply to a 4motion vehicle, since the fuel tank is different, there are two hoses that join the two parts of the tank, one of the hoses whistles when you blow into it and theres NOTHING inside that hose, I can see from end to end inside it, its not clogged, its completely empty! How is it possible that this hose can cause this noise? One of the sides of that hose goes on to a valve thats on the left part of the fuel tank, but the other side of that hose goes on a plastic piece that I don't know where to mount... This is the side of the hose thats right next to the fuel pump, does anyone know where is it mounted? I really couldnt find a way to attach it on the pump. Link to post Share on other sites
motorrob 15 Posted July 28, 2017 Report Share Posted July 28, 2017 If you see the part to the right that is disconnected. When bolted in place there are 2 screws on either side. That plastic piece slides behind two of these screws on one side. Link to post Share on other sites
Darkbound 7 Posted July 29, 2017 Author Report Share Posted July 29, 2017 (edited) Ahaaaa! So I have to unscrew the right side put this plastic and then screw it back... or can I slide it without unscrewing? I just ordered another suction pump thats on the other side of the tank (its not new) and the hose still whistles just like the old one, I just cant figure out why????? Why are they whistling like that and what do I need to do to fix it, there is NOTHING inside the hose, I can see from end to end, if there is no way to fix it I am just going to put another ordinary fuel resistant hose to get rid of the whistling.. Edited July 29, 2017 by Darkbound Link to post Share on other sites
motorrob 15 Posted July 29, 2017 Report Share Posted July 29, 2017 You can slide it in with the screws in. (Is a little tight but does go). I'm not sure about the noise. Can you run the car without that pipe on and see if the noise dissappears. Should be ok if you have half a tank. if noise goes is it tht pipe is just trying to suck air through rather than fuel. Maybe not located in correct place. Let us know how you get on Link to post Share on other sites
Darkbound 7 Posted August 1, 2017 Author Report Share Posted August 1, 2017 Yes I've been running the car on half tank for about a week now, no noise at all coming from the pump, not one that can be heard when the seats are on top of it anyway... As far as I managed to research what this hose is about, it should create siphon effect between the two parts of the fuel tank, the non-fuel pump side was almost dry when we opened it, compared to the other side which had the pump fully submerged... Will put it back together in a week or so and see how it goes.... Link to post Share on other sites
motorrob 15 Posted August 1, 2017 Report Share Posted August 1, 2017 Happy days sounds like your getting there then. Has the siphon pipe got a fixing point on the other side of the tank? I did away with this pipe when put a walbro in tank. Link to post Share on other sites
Darkbound 7 Posted September 21, 2017 Author Report Share Posted September 21, 2017 I forgot to respond that I found the problem. The problem was indeed that the hose was not fixated on the pump, so I am guessing it was just floating above the fuel and sucking air, once I attached it on the side of the pump where motorrob showed, it stopped whining. motorrob 1 Link to post Share on other sites
Erblin goga 0 Posted August 21, 2022 Report Share Posted August 21, 2022 Hello i have aa problem with that hose that is together with a plastic i have no clue where to attach it pls can u explain how to fix it Link to post Share on other sites
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