Mercruiser 5.7L Fuel Pressure Regulator ?
05-11-2022 | 04:05 PM
#21
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Joined: Feb 2022
Posts: 54
Likes: 10
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
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
05-11-2022 | 04:49 PM
#22
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Joined: Feb 2022
Posts: 54
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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.
05-11-2022 | 08:34 PM
#24
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Joined: Nov 2004
Posts: 14,156
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From: On A Dirt Floor
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.
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.
05-12-2022 | 06:33 AM
#25
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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.
05-12-2022 | 07:40 AM
#29
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Joined: Feb 2022
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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.
