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S40 / V40 '96-'04 General Forum for the Volvo S40 and V40 (Classic) Series from 1995-2004. |
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fuel return lineViews : 508 Replies : 7Users Viewing This Thread : |
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Aug 13th, 2020, 22:03 | #1 |
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fuel return line
Hello, I see many topics in which they speak that they have a fuel return line mounted on the modified T4s, and I don't really know how it is, I would like someone to tell me how I could mount it in my car if it is beneficial, and where it is the profit, thanks
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Aug 14th, 2020, 10:01 | #2 |
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The T4 doesn't have a fuel return, what it has instead it 2 fuel pressure regulators that constantly adjust the flow so that there's nothing that needs to be returned to tank, this is in order to keep fuel temperatures down I believe, which is beneficial for performance.
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Aug 14th, 2020, 14:46 | #3 |
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But in my car I only see a pressure regulator on the rail of the injectors, what is the other one? If so, no return line is necessary, I understand
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Aug 15th, 2020, 11:32 | #4 |
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possibly phase II has two pressure regulators, but phase I seems to only have one, so I want to be able to make a return line, but I would like to know someone who takes it where it connected
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Aug 15th, 2020, 16:05 | #5 |
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It can't need one though, otherwise it would have one from the factory right?
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Aug 15th, 2020, 19:26 | #6 |
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The stock car should not need, but I have mine with 306 hp and I think it could benefit you
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Aug 16th, 2020, 09:46 | #7 |
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I think the 2nd regulator is in the tank attached to the fuel pump and sender unit assembly.
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Aug 16th, 2020, 21:57 | #8 |
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ok thanks, I'll investigate
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