420A GSX fuel rail to RS

[ion12]

Hey guys
Hopefully anyone can help me out with this. Is it possible to convert the fuel rail for a gsx or gst to a rs or gs. Looking at the part it looks possible if I can find a way to block off the stock fpr that goes on the fuel rail or would it even fit correctly? Any help is appreciated.

 

[99dsmer4g63]

Short answer no just buy the appropriate fuel rail for your application.

Other answer you may want. With enough time, money and motivation anything is possible really but I suggest you take my short answer

-Daniel

 

[jdxnc]

They're not even close to the same.

 

[BLACK'98DSM]

If you really need an upgrade, just modify your 420a fuel rail. It's probably less work than making a 4g63t rail fit. Use the pressure test fitting as your supply inlet. Remove the Schrader valve and drill the hole a bit larger. The threads can mate to a female AN fitting, I'm forgetful if it's an 8 or something else. You'll have to weld closed the stock inlet hole. You can run a braided AN line from the underbody hardline all the way to the threads on the fuel rail to eliminate some restrictions.

Some years back you could buy a billet aluminum VMS fuel rail on Ebay. I've never seen one in person, but would imagine they aren't the greatest quality at a cost of 60 bucks or so. It's probably something to sit there and look pretty but not really an upgrade.

Depending on your engine's fuel requirements, a fuel rail modification/replacement may not be necessary. If you get a stronger fuel pump and some way to actively control fuel pressure, enough fuel can probably be shoved through the stock inlet. You'll have a few other things to upgrade if you're outflowing the stock fuel rail.