Offshoreonly.com - Mercruiser 5.7L Fuel Pressure Regulator ?

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- - Mercruiser 5.7L Fuel Pressure Regulator ? (https://www.offshoreonly.com/forums/do-yourself-boating-budget/371054-mercruiser-5-7l-fuel-pressure-regulator.html)

Basketcase

05-11-2022 04:05 PM

Quote:

Originally Posted by AllDodge (Post 4831870)

Blocking off the return will cause the pressure to exceed the Reg setting and damage it. As you have found the return was plugged to try and compensate for a weak pump.

You can still get the old pump and Reg, just not from Merc. Merc sells only the conversion kits
The pump use to be made by Airtex

Ohhh. I get it. I was speaking about the factory block off of the return from the pressure regulator in the fuel rail. Nothing was done to the motor that wasn't factory.

Basketcase

05-11-2022 04:49 PM

Latest test. Engine running. Return fully open. 20 psi. By just pinching the return slightly I got it to go to 45 but I stopped there. Pretty sure it would have easily gone higher. Sounds like a bad regulator to me. I hope so. That's so much easier to change than the pump. lol.

SB	05-11-2022 08:27 PM

What is the psi spec on these things (350mpi’s) anyway ?

edit: okay, just back read. Should be 43psi ?

SB	05-11-2022 08:34 PM

oh great, just saw this notice:Mercury Marine is having an 8% price increase May 15.

Unfortunately all orders placed after noon EST May 13 will be at the new prices.
Back to subject:

Okay, 43psi it is. :) See#13 description.

https://cimg1.ibsrv.net/gimg/www.off...ba022ceea1.png

Basketcase

05-12-2022 06:33 AM

Yup. 43 psi and I'm at 20. lol. But by manually regulating I'm able to get and maintain 45 with the engine running. I'm going to try a reg. If the pump wasn't such a bear to swap I'd do that too, but that is going to require a lot of swearing to get done.

AllDodge

05-12-2022 07:14 AM

Looks like I'm not getting notified of a response via email. What I have for Reg861126A1 Cool Fuel Gen 2 (43 psi) BLUEMallory 9-33206, Merc 892681

Basketcase

05-12-2022 07:19 AM

Kinda funny. Someone on a FB group pointed out that the OEM part is made by Keihin and is the same reg as a honda civic. See photos.....IDK if I trust it enough to do it, but its interesting for sure.

https://cimg6.ibsrv.net/gimg/www.off...db509533ee.jpg
https://cimg7.ibsrv.net/gimg/www.off...d721c5b27b.jpg

SB	05-12-2022 07:26 AM

Btw, which fuel system do you have ? Some systems use a regulator down near pump, which makes the regulator on the fuel rail just a dampner if you will.

Basketcase

05-12-2022 07:40 AM

Quote:

Originally Posted by SB (Post 4831917)

Btw, which fuel system do you have ? Some systems use a regulator down near pump, which makes the regulator on the fuel rail just a dampner if you will.

That's what I have. The reg on the rail has it's return blocked from the factory. The reg that works is mounted on top of the cooler.

SB	05-12-2022 07:43 AM

I believe there is a 30psi keihin nr-1 and a 43 psi nr-1. So, be careful.

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