Fuel Pressure

[macatoni]

Just installed a new racetronix fuel pump and upgraded in tank harness. Went to set the fp at idle and compared to the old walbro pump I had 60psi with the line off. Started backing out the adjustment screw and got it down to 48ish but I was weary of backing out the screw any farther as it was unthreaded quite some ways and the fp wasn't dropping any more which makes me think I hit the limit of the acufab fpr adjustment. Anyone experience this? Do I need to bite the bullet on a different fpr In hopes it's just the acufab...

 

[Boost231]

It's not the regulator, you are overwhelming the stock return line. Time to address the return line issue.

 

[macatoni]

What's the stock return line known issue? It wasn't overwhelmed with the walbro 340 pump running at the correct psi....should I check for a kink?

 

[TexasT]

You can look it over but the return line is known to be a restriction. Many go with a larger feed line and use the stock feed line as the return.

 

[macatoni]

Ok ill start researching the return line. I guess im just surprised that how much more flow the Racetronix 255 is vs the walbro 340m.....

 

[dynoman]

My Accufab regulator I just installed started at about 20psi and I had to adjust it up , but I had also replaced feed & return lines ( -8 feed , -6 return ). Definitely check your return .

 

[2QUICK2B6]

great info ill need this in abt 2 yrs

 

[87hottness1]

My Accufab regulator I just installed started at about 20psi and I had to adjust it up , but I had also replaced feed & return lines ( -8 feed , -6 return ). Definitely check your return .

Where did you get the line to run your new return line and what fittings did you use ?

 

[precizion818]

Got my fittings from Racetronix and line from Jegs. Line is made by NOS


Sent from my iPhone using Tapatalk

 

[Steve]

You can likely get away without having to replace the return line completely. I have a car with a 340 lph pump and a stock return line with no issues. I did replace the regulator with a Fuelab 6an inline regulator and I opened up the stock return line fittings slightly. I had it working fine with the Accufab regulator just by opening up the fittings but I went ahead and replaced regulator because the Fuelab regulator is less restrictive and is far superior to the Accufab unit. I wish I would have just replaced the regulator alone first because I think that may took care of the problem by itself. Every little bit of restriction you remove will help.

 

[dynoman]

Where did you get the line to run your new return line and what fittings did you use ?

I bought the complete kit from racetronix ....twin 340s , braided Teflon -8 and -6 lines with filter. Full Throttle sell it now.



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