Can't lower fuel pressure below 64psi

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Aug 23, 2008 | 06:17 AM

The real Ryan

Thread Starter

Type-R; Tight Car

Joined: Feb 2003

Posts: 3,429

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From: Seattle, WA

Can't lower fuel pressure below 64psi

B18c5 motor with a Jackson Racing Supercharger setup. Fuel mods are:

JRSC Fuel filter
255 lph Fuel pump
AEM Fuel pressure regulator
RC injectors

I tried to adjust the regulator down but the lowest the fuel pressure drops to is 64psi. Does anyone know why in the world I wouldn't be able to adjust it any further?? That is entirely too much presure for a honda motor.

Aug 23, 2008 | 08:03 AM

toyota_aristo

Registered Member

Joined: Dec 2007

Posts: 233

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From: Chesapeake and NOVA

Re: Can't lower fuel pressure below 64psi

What size hoses are you using? I haven't done the math, but a small hose in conjunction with a big pump could act a little like a regulator and bottleneck your fuel pressure. I may be wrong. Good luck.

Aug 23, 2008 | 09:36 AM

The real Ryan

Thread Starter

Type-R; Tight Car

Joined: Feb 2003

Posts: 3,429

Likes: 0

From: Seattle, WA

Re: Can't lower fuel pressure below 64psi

Thanks for the input. As far as I know it is the stock lines from the pump to the fuel rail, from there it is a 1/4 line to the regulator then the stock return line.... I have no idea what could be causing it...