Adjustable Fuel Pressure Regulator

[Stephen]

As my Samurai is slowly being revived from it's coma, it's been found that it needs more fuel pressure than what the stock regulator provides. And since it's a closed unit that we can't just open up and fiddle with, I'm in need of an adjustable one. As it's a Samurai, it doesn't need to provide much pressure, it needs a minimum pressure of 11psi and the max is ~50psi. I've asked the internets, and they told me that there are many, many options to choose from. So I thought I'd ask RME if anyone has a suggestion or experience so I might be able to narrow the options a bit.

 

[TurboMinivan]

I always choose Accufab adjustable FPRs on my turbo Mopars, such as my former turbo Caravan.

They are a high quality, attractive design that works very well. Depending on which injectors I was running, I would dial in a 'base' pressure of 30 or 55 psi. I know mine can go lower than 30 psi, though I never tried to find out how much lower it could go since I needed at least that amount.

The one I use (pictured above) is vacuum/boost referenced, though I doubt you'll need that capability. Still, I'm sure they'll have a model that suits your application. I'd recommend Accufab to anybody.

 

[B2-Bomber]

Use summit racing's website. You can search FPRs by their pressure ranges

 

[B2-Bomber]

Another thought is that most injectors don't really operate below 30 psi. Only the gm tbi injectors can function that Low as I recall

 

[Tacoma]

I've got one here on the Isuzu. I'll pull it off before I scrap it. Has a gauge and everything too!

 

[littlyota]

I always choose Accufab adjustable FPRs on my turbo Mopars, such as my former turbo Caravan.

They are a high quality, attractive design that works very well. Depending on which injectors I was running, I would dial in a 'base' pressure of 30 or 55 psi. I know mine can go lower than 30 psi, though I never tried to find out how much lower it could go since I needed at least that amount.

The one I use (pictured above) is vacuum/boost referenced, though I doubt you'll need that capability. Still, I'm sure they'll have a model that suits your application. I'd recommend Accufab to anybody.

Do you have a link to these? Do they have a port for a Guage?

 

[Stephen]

I've got one here on the Isuzu. I'll pull it off before I scrap it. Has a gauge and everything too!

Thanks, that'd be cool. Did you ever post that thing on Planet Isuzoo? You might get a buyer for it rather than just scrapping it. Save the Impulses!

 

[TurboMinivan]

Do you have a link to these?

https://www.accufabracing.com/fuel/regulators

Do they have a port for a Guage?

No, at least not the model I use. In my car's case, the fuel rail itself has a schrader valve right on it, which works well for (temporarily) mounting a gauge to dial in the regulator. Once it is dialed in, I almost never need to reattach the gauge; I make a mark on the adjustment dial so I can tell where the initial set point is. At the drag strip, I will make small adjustments to compensate for atmospheric conditions (perhaps adding 1/4 or 1/2 of a turn if the EGT gets too high, for example) but that's it.

HTH