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Charter Member
Do the mechanical stock pumps always pump same pressure, or does it increase with rpm?
How much pressure can a Q-jet take before it unseats?
Thanks
added:
Is it possible for a stock Merc high volume pump to put out 20psi at 2000rpm? Curious if a buddy was sold the wrong pump.
Last edited by US1 Fountain; 07-04-2011 at 06:40 PM.
Some people are like Slinkies - Not really good for anything, but they
bring a smile to your face when pushed down the stairs.
Pump Pressure
Stock pump about 5 to 6.5 lbs depending on the RPM . Anything over that your asking for problems. Damaged needle and seat bent float arms from fuel comming past the seat. If your going to run a high volume pump put in a fuel regulator and set it about 5 to 6 lbs.
The pump volume increases with rpm but the presure should not exceed 7 psi on a stock mechanical fuel pump. Sounds like the pump is wrong or defective.
Charter Member
Ok, thanks guys.
This is a buddies boat been working on last couple weekends. stock '88 454. Dumps fuel past N/S. tried new kit, float and carb body, no change, thus eliminated carb as the culprit. He just put a press gauge on it today.
Some people are like Slinkies - Not really good for anything, but they
bring a smile to your face when pushed down the stairs.
Platinum Member
I get 8psi at idle. 1050 Dominator, holley 120GPH six valve marine pump. High flow needle and seats, no problems.Originally Posted by US1 Fountain
However, you are working with a different animal. Sounds like he may be needing a pump.
Charter Member
I agree now that we know what the pressure actually is. I didn't think the mechanical pump was capable of that high of a pressure, so it never entered my mind as the problem.
A new pump is on it's way now.
Some people are like Slinkies - Not really good for anything, but they
bring a smile to your face when pushed down the stairs.
US1 The slinkie joke is some Funny s##t thanks!
Charter Member
...
Some people are like Slinkies - Not really good for anything, but they
bring a smile to your face when pushed down the stairs.
what kind of volume and or pressure will a factory mechanical pump from a 502mag off the water pump give???
will it support a 502 carb motor with a 800cfm holley without the electric pump that is high pressure for the efi
Offshoreonly Advertiser
Some of the OEM Merc pumps are doing just that - too much pressure. We have warrantied a bunch.
Marc
www.mercruiserparts.com
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