Tbi swap build thread

[rfmaster]

Originally Posted by FRENCHBLUE72

Hey guys I put on a summit brand fuel fuel pump that is rated at a free flow rate of 43 gph and a max pressure of 85 psi will this work as is or should I regulate it somehow?

As long as you have 5/16 or 3/8" return line built-in FPR should be able to handle it. When manufactures specify fuel pressure they usually publish "deadhead" pressure. Typical FP has a two dimensional performance curve - Y axis GPH and X axis working fuel pressure. Most marketing data published is very incomplete! So at near zero fuel pressure this pump is capable of delivering 43 GPH, but as fuel pressure increase the volume decreases (usually non linear curve) until deadhead pressure is reached.

//RF

[rfmaster]

Originally Posted by rfmaster

As long as you have 5/16 or 3/8" return line built-in FPR should be able to handle it. When manufactures specify fuel pressure they usually publish "deadhead" pressure. Typical FP has a two dimensional performance curve - Y axis GPH and X axis working fuel pressure. Most marketing data published is very incomplete! So at near zero fuel pressure this pump is capable of delivering 43 GPH, but as fuel pressure increase the volume decreases (usually non linear curve) until deadhead pressure is reached.

//RF

Correction - Y axis is Flow (GPH), X axis is pressure (PSI)

Walbro is one of the few mfg that publish their performance curves.



and another



But you get the idea...