Um does any one know the exact location of the fuel pressure regulator on the VR 5.0, I know its on the fuel rail somewhere but where exactly. Cheers
on the back of the rail one side has a pipe going to it, the other has a pipe, small vac hose going to a small cannister looking thing
Cheers, wen`t out and had a look it`s on the back of the drivers side rail the vac line looked like it was kinked a bit and I have now straightend it out, so far so good.
BTW, If it was kinked, gently slide the rubber hose off the regulator and check under the kink. I did this last week and found the rubber hose had a crack underneath the kink, allowing air to enter and most probably upseting the fuel regulation cycle. Replacing it isn't too hard, just purchase similar rubber hose but don't pull the old one YET! Take off the front engine cover to get access to the hose as it enters the top front of the intake manifold. Take either end of the old hose off and connect/tie etc the new one onto the old hose, then while wiggling the hose around gently pull it through. While your at it replace the MAP sensor rubber hose as well. Its slightly bigger diameter. At about 150,000 km, both hoses go very hard and brittle so its a good idea to replace them both. Cheers
Both the MAP sensor and fuel regulator hoses connect to the intake manifold right at the front of the engine. They then both run in parallel under the gap of the intake manifold towards the rear of the engine. At that point the regulator hose goes left [drivers side] and MAP hose to the right [passenger side].
I thought I`d be smart and replace the hose with a slightly bigger diameter one and clamp it down both ends, the engine now starts alot easier and the exhaust smells more "burnt". What I mean by that is that before the exhaust smelled like it was 75% burnt and 25% fuel vapour. I am wondering, is any negative side affects to having a bigger hose here?
Hm..............Im an electronics engineer, not a fluid dynamics expert. Having a larger diameter hose means there is more air mass to move [or suck in this instance] so does this somewhat affect the operation of the MAP and fuel regulator operation? Who knows, I don't think so but I'm sure there are other experts on this matter that may have a concise answer to your question. Anyway glad to hear it helped.
