Tank to pump hose routing

[Zed Head]

On 1/13/2025 at 8:19 PM, chaseincats said:

I just took the car around the block and it is incredibly sluggish (acceleration sits in the 15-17 range on the air fuel ratio gauge).  I pulled over and unplugged the fpr vacuum hose and with 38 psi, the car is a rocket again - so the gauge fuel pressure gauge is right there definitely is a fuel pressure issue here

When you unplugged the vacuum reference hose you raised the fuel pressure in the fuel rail, engine running, making the fuel-air ratio richer at low to mid-range throttle opening.  You would feel that effect if you were running lean before.  At open throttle you'll get the same effect as removing the hose since there will be very little vacuum in the intake system so you shouldn't feel any difference, hose on or off.

You might try the fuel tweak modification and see what happens.

https://www.atlanticz.ca/zclub/techtips/tempsensorpot/index.html

[Captain Obvious]

11 hours ago, chaseincats said:

Just to be sure I'm not barking up the wrong tree with blockages/restrictions - the pump wouldn't be the issue right?  Since it's an electric pump it will either work or it won't and not become weaker, correct?

I don't know what's going on yet, so I'm not ready to let the pump off the hook. Is there a way you can see what happens to the fuel pressure while you're driving?