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#11
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I couldn't see past that so assumed it was connected to it So it goes further down and connects to the fuel filter?? What does it use it? EVAP? Sent from my iPhone using Tapatalk Pro
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2005 Imola 4.8iS |
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#12
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The fuel pressure regulator is built into the fuel filter and is (WAS PREVIOUSLY) vacuum modulated. BMW changed the programming in the DME so that fuel pressure no longer needs to be modulated by engine vacuum(probably partly because it also needs to deal with fuel pressure changes because of the jet pump system and the fact that the return is the bottom of the tank). Instead of making another part number fuel filter they just use the original parts and put the hose to the intake tube instead of the manifold. This way the regulator gets vented and if the diaphragm does ever rupture the excess fuel will get sucked into the engine and alert the driver immediately and not spew fuel on the ground till it gets noticed who knows when.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) Last edited by 80stech; 10-04-2018 at 10:53 AM. Reason: wording |
#13
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It is my understanding the vacuum line on the fuel pressure regulator is a vent only. The is no vacuum ahead of the throttle valve.
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#14
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I know it was connected to the intake boot, which some have stated i can cap off now? Do i not need this hose? Was this a hose to vent the ccv diaphrams? As i just replaced those with the updated versions that do not have nipples. |
#15
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Read the thread, it's pretty much covered.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
#16
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Early N62's had vaccuum reference lines to the CCV valves, but those were removed pretty early on and the hoses should be removed and the bungs capped off if later CCV's without the vacuum nipples are installed.
The line in the picture 5 posts up from this post, is the fuel filter vent line - it goes from the fuel filter to the intake elbow in front of the throttle body. |
#17
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Thanks, i have re-read, i was just getting a bit confused as there were several suggestions as to what it could be. Looks like i do need this if it to vent fuel.
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It does still have the all in one T branch breather hose, though i have the newer seperate ones on order. |
#18
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No this doesn't vent any fuel, just exposes the fuel pressure regulator to atmosphere without letting dirt or water in. You can disconnect it from the boot if you want but let the hose hang down and don't plug it, plug the fitting in the boot though. Leaving it hooked onto the boot might give you slightly less a chance of setting off a CEL with a plugged air filter but leaving it off eliminates the risk of sucking a large amount of fuel into the engine if the regulator diaphragm ruptures which is pretty rare but does happen. You should make sure the short portion at the regulator is OK as that is very likely in poor shape.
This is all M54 knowledge but it sounds like the V-8s have the same thing just looks a little different where it goes into the boot. The other end of the line goes onto a metal tube which runs down under the car to the fuel filter if you want to make sure.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) Last edited by 80stech; 01-20-2025 at 11:34 PM. |
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