1.8L Fuel Pressure Regulator |
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1.8L Fuel Pressure Regulator |
Rob-O |
May 11 2016, 09:59 PM
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#1
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Senior Member Group: Members Posts: 1,252 Joined: 5-December 03 From: Mansfield, TX Member No.: 1,419 Region Association: Southwest Region |
Changing back to FI, but a new Fuel Pressure regulator from Pelican. Installed it but didn't realize until this evening that the new regulator pressure is controlled by a bolt that is threaded through the center of the regulator, and a lock down nut holds the bolt in place. In other words, it is mechanically controlled, versus the pressure controlled regulator that I had.
Not sure if the new regulator is supposed to be that way (this part supersedes the old part) or if Pelican send me the wrong part. Just thought I'd throw the question out there tonight. Like an idiot I threw the box out so I don't know the part number of the new part. And wouldn't you know it, now that i've installed the part the part number is in an area that I can't see. No issues with pulling it out if needed. But thought the brain trust here may know off hand. |
timothy_nd28 |
May 12 2016, 08:40 AM
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#2
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Advanced Member Group: Members Posts: 2,299 Joined: 25-September 07 From: IN Member No.: 8,154 Region Association: Upper MidWest |
Ljets are very sensitive to vacuum leaks, we all know this. In addition to that, Ljets are also very sensitive to incorrect fuel pressures. The fuel system is dependent on absolute manifold pressure so that the pressure drop across any injector is held constant while at any throttle position.
To maintain fuel pressure at any RPMs, I would assume the high vacuum (at idle) would cause the fuel regulator to close which would then would dump fuel (bleed off) via low pressure back to the fuel tank. As the engine rpm increases you would observe less vacuum and as the vacuum decreases proportionally this would open the fuel regulator and less bleed off fuel back to the tank. All in all, this regulator has a feedback device which helps maintain homeostasis in the system. Regulators without a vacuum line would have no idea what the engine is doing. |
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