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Old 06-03-2019, 01:34 PM   #1
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Fuel pressure regulator

Hi,
I am soon going to replace the fuel filter and noticed that the fuel pressure regulator while engine is running has a hissing sound only when I open the hook and it is not noticed from inside the car, and was wondering if it is also needed to be replaced as it has such a sound. How often is it needed to be replaced?


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Old 06-03-2019, 03:14 PM   #2
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Only when not operating.
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Old 06-03-2019, 03:44 PM   #3
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Originally Posted by simonfocus View Post
Hi,
I am soon going to replace the fuel filter and noticed that the fuel pressure regulator while engine is running has a hissing sound only when I open the hook and it is not noticed from inside the car, and was wondering if it is also needed to be replaced as it has such a sound. How often is it needed to be replaced?
You should not have any air movement to the atmosphere in the regulator. What exactly do you mean 'open the hook'? The regulator is only replaced when it fails.
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Old 06-03-2019, 04:55 PM   #4
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open the hoo(d)...........spelling
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Old 06-04-2019, 03:46 AM   #5
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Sorry for misspell :( I mean when the engine HOOD is opened and get close to the regulator I can hear a hissing noise, there is no leak at all.
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Old 06-04-2019, 03:48 AM   #6
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but when the regulator fails, it prevents to start the engine, shouldn't it be replaced after some years/milage like fuel filters?
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Old 06-04-2019, 04:55 AM   #7
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You generally don't unless faulty as some will last as long as the car.
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Old 06-04-2019, 11:57 AM   #8
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Sorry for misspell :( I mean when the engine HOOD is opened and get close to the regulator I can hear a hissing noise, there is no leak at all.
Hissing noise means you have a vacuum leak (sucking in air.) The hoses near the intake manifold are brittle when old. Go through them and gently squeeze and try to find what makes the hissing stop. Replace those hoses.

IF blocking the only hose going to the regulator makes the hissing stop the regulator needs to be replaced. I have a fuel rail for an SVT model (ST170) but I don't know if they are interchangeable.
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Last edited by limeyrider; 06-04-2019 at 12:04 PM.
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Old 06-04-2019, 01:42 PM   #9
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Quote:
Originally Posted by limeyrider View Post
Quote:
Originally Posted by simonfocus View Post
Sorry for misspell 😞 I mean when the engine HOOD is opened and get close to the regulator I can hear a hissing noise, there is no leak at all.
Hissing noise means you have a vacuum leak (sucking in air.) The hoses near the intake manifold are brittle when old. Go through them and gently squeeze and try to find what makes the hissing stop. Replace those hoses.

IF blocking the only hose going to the regulator makes the hissing stop the regulator needs to be replaced. I have a fuel rail for an SVT model (ST170) but I don't know if they are interchangeable.
This. I discovered my plastic line was broken at the regulator today.
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Old 06-04-2019, 07:28 PM   #10
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CLARIFICATION: AS LONG AS the line up to the connector on the regulator... the rest would be the the lines themselves.
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