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Can I swap my 4.3 Fuel Rail with a 4.4 Fuel Rail?

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Swick444
Posts: 1
Joined: 23 Sep 2025, 23:00
Year and Model: 1997 850 T5 Wagon
Location: Macomb MI

Post by Swick444 »

Hello everyone, this is my first post here :D I have 87 850 T5 that's getting new injectors eventually & a tune! The only issue is they need a 4.4 Fuel Rail, not 4.3:/ I was wonder if its possible to swap over & if so, what steps I would need to do to proceed with the process? Any help is great apricated :D Love all the builds I see here<3

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misha
Posts: 5437
Joined: 07 Dec 2008, 16:09
Year and Model: 2010 Volvo S80 D5
Location: Serbia
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Post by misha »

Injectors will fit on both fuel rails,they are interchangeable between m4.3 & m4.4 management.
They are physicaly the same...flow could be different but not necessarily.

You can't fit m4.4 fuel rail on m4.3 car because....m4.4 fuel rail have damper where m4.3 have fpr and because of that it doesn't have return line from fpr under the rail...on m4.4 cars return line is behind passenger's rear side wheel where fpr is.

The rail itself for m4.3 management can be retrofitted,but it needs some modifications.
2010 S80 D5 / restyling / fully equipped / Twin turbo / Savile Gray Metallic (492)

History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon

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