I know it’s had to of been covered a million times but can’t find specific information on running a fuel return line to the fuel pump hanger using the existing gs300 fuel pump. What else is there to do except for tapping into the top of assembly and running a fuel line to the return side of the fuel rail?

ive read that some people jb weld and pinch the opening of the regulator and tee off into the return line fitting and run a tube to the passenger side saddlebag tank? Please help

 

The things you said are correct. Drill and thread a hole in the rail for the return line and create you own return port fitting into the hanger top. The reason you pinch the line you are talking about is because that is the OEM return for what fuel isn't used past the stock fuel pressure. 42 or 43.5 psi or something like that. By blocking that off, it sends all fuel through the feed line and thus back through your added return line. You will need to put in an aftermarket regulator "FPR" in the return line after the rail somewhere to maintain the 42-43.5 psi at the rail/injectors. In order to still have fuel siphon from the other side of the saddle tank, you run a tube from your custom return port on the lid down to the jet valve where the line use to come off the regulator that you remove/pinch. This way the returning fuel still moves through the jet valve and siphons the fuel over. Otherwise you run out of fuel at 1/4th tank.

 

This pic is helpful to understand a return system. As you can see, the return line comes back to the jet valve to keep the siphoning effect working.

 

Thanks a lot for the quick response! Is what you’re saying for a NA-T setup? I’m sorry I should of mentioned that I’m doing a stock aristo swap in a 98’ gs300. Won’t be going single turbo for a while so the stock pump will work to my knowledge.

I saw in a youtube video that someone pinched the tube and filled it with jb weld but he was running aftermarket pumps. Thanks for the illustration!

 

Well I think you are going to need a bigger pump to feed the larger injectors that the GTE uses. I'm pretty sure they have better pumps than a gs300. The GTE cars use return systems in stock form too. I think you should upgrade to a walbro 255lph and make a return system. But at least upgrade the pump.