Save youself some trouble and buy a CV billet pump (rebuildable/adj pressure) and never have to worry again.

Gotta link to them?

+ 1. Randy

I edited your post to complete it.....

CV products. I run these on my engines and you want need anything else ever in my opinion. A little pricey BUT after you buy a new Merc pump, then have to buy a KE billet bowl to get only a little extra volume/press you couldve bought one these and been done.


SPIN-MP-2616---High Pressure/High-Flow Nickel Plated Billet Fuel Pump, BBC Marine Billet

Item #:

SPIN-MP-2616

Price

$520.62

Product Description:
CV Products created the SPIN-MP-2600 Series High Pressure Nickel Plated Billet Fuel Pumps to provide racers with an unparalleled level of performance, durability and quality. In response to the engine builder's need for higher performance and greater fuel flow while maintaining consistent pressure we designed and manufactured the High Flow Fuel Pump.The fuel pump contains unique valving that allow it to flow up to 1200lbs.per hour at 8 PSI.
To achieve superior durability, the pump has a CNC-machined 6062-T6 billet aluminum housing and an arm that is mirror-polished that helps to eliminate burrs and stress fractures. The pump's internal valving is rebuildable and is resistant to the corrosive effects of alcohol, which allows it to outlast previous alcohol-ready pumps.
•High Pressure/High Flow Design - Unique valving flows up to 1200lbs. per hour at 8PSI.
•Versatile - Four standard diaphragm assemblies make it perfect for use with fuel/gas/alcohol or marine applications.
•Durable - Bright nickel finish is resistant to alcohol or salt water in marine applications.
•Proven Performance - Based up on the highly successful design of the SPIN Series 2000 Billet Fuel Pumps.
•Rebuildable - Internal valving is rebuildable for years of service life.
•Marine Pumps are Vented per Coast Guard regulations.





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Tech Notes:
•BBC Marine Billet
•Special Spring - White
•Pressure - Medium
•Flow - High





CV Products carries the complete line of each of its manufacturers.

I did not see this mentioned in the thread. A less expensive solution...
Airtex 60932 Mechanical Fuel Pump for 1992-93 Mercruiser Marine 454 and 502 8 Cylinder amazon price 45.00. Then use an upgraded bottom section if you want to.

That's the right name Airtex not Aeromotive, sorry for the confusion. Airtex is O.E. supplier to Merc for the pumps