2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

FPR problem

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Old May 31, 2011 | 03:46 PM
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The Wildchild's Avatar
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From: Healy AK
FPR problem

So it seems like me fuel pressure regulator is clogged or something, i just got done with a rebiuld so it did sit for a little while. when i tried to start it the wide band was showing really lean and well there wasnt any fuel past the point of the regulator... so is there a way to clean them or anything like that?
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Old May 31, 2011 | 03:57 PM
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From: Healy AK
i also premix the gas if that changes anything...
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Old May 31, 2011 | 04:01 PM
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if it's lean and nothing is moving past the fuel pressure regulator to the return line then your fuel pump is dead or fuel filter clogged.

that or you're testing everything wrong and the lines are simply reverse to the rats nest hard lines.
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Old May 31, 2011 | 04:01 PM
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From: https://www2.mazda.com/en/100th/
no fuel coming out of the regulator + really lean = clogged filter(S), bad/weak fuel pump.

the regulator works by RESTRICTING the flow, so no fuel SHOULD be high pressure, which SHOULD be rich, unless there isn't enough fuel getting to the regulator
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Old May 31, 2011 | 04:08 PM
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From: Healy AK
well i have a 255 fuel pump and when i pulled the hoes off the top of the fuel filter there was a lot of pressure in there.
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Old May 31, 2011 | 06:26 PM
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Originally Posted by The Wildchild
well i have a 255 fuel pump and when i pulled the hoes off the top of the fuel filter there was a lot of pressure in there.
alot of pressure or alot of volume? most people confuse the 2. you can have lots of volume and no pressure which would = what you may be experiencing. a fuel pump at 5 volts will still put out fuel like a garden hose but probably not be very much pressure. also on that note, if you do have pressure and volume, you probably have the lines reversed.
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Old May 31, 2011 | 09:22 PM
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From: cleveland
You most likely have the fuel lines on backwards.
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