dwilson

Hey guys, last night i installed a Walbro 255 HP Fuel Pump, B&M Command Flo Fuel Pressure Reg., B&M Gauge on my civic HB. It has a Ls swap in it and has been running with the Dx pump so i thought it was time for the change. So i installed with no problems or leaks. Now my question when i went to adjust the fuel pressure to the factor spec. in the Helms manual . My B&M Reg. would only back it down to 58 psi. Another thing when i take off the vaccum line from the regulator it is suppose to raise the psi right. Well when i take the hose off of my regulator it does nothing stays at the same pressure whether the hose is on or off. Has anyone ever had anyone these problems . Does anyone have any clue of what could be the cause of this. Any info would be helpful.

Thanks, David

5 Liter Eater

The Walbro pump pumps too much fuel and overwhelms the stock FPR, even with the B&M on top. Current best solution is to drill a ~.040" hole in the inlet of the FPR as shown on http://www.theoldone.com/articles/regulator/. That will allow you to be able to lower the pressure.

If the pressure does not change it's because you have the B&M backed out too far and it's not compressing the spring so having vacuum or not makes no difference. Crank it in and you will see a difference.

HTH

dwilson

Anybody know what .035" is in a fraction.

Giuseppe

(sigh) its a simple fraction man.!
7/200

dwilson

nope they dont sell it in a fraction for that small or i couldnt find it. It is known at the hobby shops as a #65 or i heard that a simple 1/16 will work .

Giuseppe

.040

is 1/25 look for that!

dwilson

yeah they have that one too. it is like a #63

zojirushi

will installing the airtex inline fuel pump increase the pressure at idle???

dwilson

i would think so, but i havent used a inline pump, so im not for sure. I would think anything that was bigger than stock would increase pressure. The walbro increased mine so much that i cant back it down to factor spec as previously stated.