Fuel Inlet Upgrade for DS Pumps

Quadstar Tuning LLC

  • $27.99
  • Save $2



DS4 injection pump 3/8" fuel supply upgrade.  This replaces the restrictive factory 1/4" inlet fitting that screws into the regulator assembly and allows you to run a new, larger, fuel supply line directly to the injection pump.

Now featuring 100% aluminum construction! Our adapter fittings are milled from virgin aluminum stock, specifically for this application.

New for 2022! Now Includes both 90* AND Straight hose adapter fittings. 

All fittings are full-flow style for maximum performance and the hose barb is a push lock style. Does not require an unattractive hose clamp or expensive braided hoses for this low pressure system.

We recommend upgrading to an aftermarket spin-on style fuel filter and ditching the factory FFM to completely modernize your fuel system.


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