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Fuel Pressure Regulator Not Connected...?

jwah

By jwah,
in General Maintenance

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jwah Collaborator

jwah

Posted
Posted

Well last night i decided to do a bit of work to my car and when i was fiddling around in the FPR area i noticed that a hose looked a little bit loose, so i grabbed it and it fell off, it looked like it had been broken for some time. Im just wondering what happens when the FPR isnt connected? Ive noticed my car being a bit fuely lately but yeah, should the car even run? I never noticed a Vacuum leak but yeah.

Cheers

BH_SLO32 Proficient

BH_SLO32

Posted
Posted
Well last night i decided to do a bit of work to my car and when i was fiddling around in the FPR area i noticed that a hose looked a little bit loose, so i grabbed it and it fell off, it looked like it had been broken for some time. Im just wondering what happens when the FPR isnt connected? Ive noticed my car being a bit fuely lately but yeah, should the car even run? I never noticed a Vacuum leak but yeah.

Cheers

It will run richer than usual on idle (or when a vacuum is generated in manifold) and leaner than usual when running boost. The fuel pressure regulator is intended to maintain a set base fuel pressure relative to the pressure in the intake manifold (via the hose connection). The pressure in the manifold opens further or closes further the fuel pressure regulator depending if you have a vacuum or postive pressure (boost). The vacuum opens the regulator further resulting in a decrease in fuel rail pressure and boost closes the fuel pressure regulator more resulting in an increase in fuel rail pressure.

Hope this helps

Cheers

MANWHORE Grand Master

MANWHORE

Posted
Posted

Hopefully not too long.

The fuel pressure regulator is what controls the amount of fuel going into the engine.

One of my friends has killed an engine just because the fpr vacuum hosing split prior to a track day.

That's why I always change that particular hose on all my cars as soon as they look the slightest bit suspect. It's cheap insurance for like $5.

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