Offshoreonly.com - 525sc fuel pressure

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houde0069

10-14-2012 06:42 PM

525sc fuel pressure

Just ordered a Holley black. Their website says pump runs 140hph at 14psi..... Need to know if I need to regulate that down to 7psi?
It's a stock 1995 525sc

dykstra

10-14-2012 09:09 PM

I would think so. PM GRIFF he is the resident 525SC guru.

badluck

10-14-2012 11:42 PM

I would regulate it down to 7psi. Not sure if the needle valves would seal with too high preassure.

MILD THUNDER

10-19-2012 08:28 AM

Yes, it needs to be regulated down to 7psi. Why the change? Stock pump is just fine to support it.

Back4More

10-19-2012 05:32 PM

Yeah, Why?

houde0069

10-20-2012 09:07 AM

Quote:

Originally Posted by Back4More (Post 3798957)

Yeah, Why?

Long story short I thought the pump was bad.. Turned out it was the oil pressure switch. So now I have a extra Pump.

Biggus

10-20-2012 09:27 AM

Quote:

Originally Posted by MILD THUNDER (Post 3798621)

Yes, it needs to be regulated down to 7psi. Why the change? Stock pump is just fine to support it.

FWIW, I'm not a fan of mechanical fuel pumps in hi demand applications. They all seem to gradually lose fuel pressure over time due to premature fuel pump cam lobes going flat. -Even with several different tipped push rods.

Swapping to all electric fuel pumps eliminates a source of metal in the oil.

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