Fast Fred's OMC Mod 50 secrets Thread #2

[Tim Kurcz]

The Mr. Gasket (Micro) Solid State Electric Fuel Pump is designed to replace
the original equipment fuel pump on carbureted cars, trucks, industrial and farm
equipment, including lawn and garden. A fuel pressure regulator is recommended
if using on a carburetor.Works great for fuel transfer systems in gasoline
applications as well as an excellent booster pump for the existing mechanical
pump. (NOT FOR FUEL INJECTION SYSTEMS.) The Mr. Gasket Micro Fuel Pump
provides extreme reliability, fast engine starting in hot and cold weather without
vapor locking problems. When installed properly the Mr. Gasket Micro Fuel
Pumps will provide a constant fuel supply under all conditions (Original
Equipment only, not recommended for high performance or modified engines,
not recommended for any type of aircraft or marine application).The Mr. Gasket
Micro Pump is a self priming fuel pump with simple two bolt and two wire
installation, with extremely low amp draw. (Average 2 amps at maximum delivery).
NOT FOR USE WITH DIESEL FUEL!

Pump Mounting:
Locate a pump position about 12’’ from the fuel tank and as close to the lowest
level of the tank to ensure proper fuel supply (refer to Diagram #1). Clean
mounting area by removing all rust paint and grease, surface should have a shiny
appearance when correctly done. Use the pump mounting bracket as a template,
drill two 7/32’’ holes. Next use the supplied self tapping bolts and star washers to
secure the pump, and ground lead to the frame. Always use a location that
enables you to add the safety nuts provided. Install the supplied filter in the
pump inlet and outlet using thread sealer, tighten to 10-ft-lbs.

Now install the hose to the inlet side of the pump using automotive quality
hose clamps. Always replace hose with approved fuel line. Some tank outlets
may have a size of 3/8’’ instead of the supplied 5/16’’ fittings. You may need to
purchase one 3/8’’ barb x 1/8’’ NPT and the correct length of 3/8’’ approved fuel
line. Install the correct size neoprene fuel line from the outlet port on the fuel
pump to the factory metal fuel line going to the engine bay. (Never run rubber
fuel line from rear of vehicle to the front) If no fuel line exists, fabricate hard line
from pump to engine bay. This pump is for negative ground systems only!
Make sure to use the red lead for 12 volt power and the black lead for ground!
Remember the ground lead connection is just as important as the positive lead.
The RED positive lead needs to be connected to switched ignition terminal. Make
sure a 5 amp fuse or in-line fuse holder is utilized. Use only quality automotive
grade electrical cable, minimum of 16 gauge, 14 gauge if wire run is over 20 feet.
Ensure that all connections are secured with a good solder or quality crimp-type
connector. Be sure connections are sealed from the elements.

Finally protect the cable from abrasion with Mr. Gasket part number 4500
flexible tubing. If not using as a booster pump for the existing mechanical
pump, a longer fuel line will need to be installed from the metal frame line to
the carburetor. Use only gasoline rated fuel line, be sure to route away from
exhaust. A fuel regulator is recommended like the adjustable Mr. Gasket #9710 as
well as a filter close to the carburetor like the Mr. Gasket #9706,9747, and the #9745.

Inspect and tighten all connections before start up. Turn the key to the on
position to prime, leave on for ten seconds then turn off. Inspect for fuel leaks.
If leaks are detected re-tighten clamps. Vehicle should now start. Let the vehicle
run for several seconds, turn off and re-check for leaks. Check pump and fuel
line connections and filter every 5,000 miles. Remember an electric fuel pump
is very efficient pushing fuel, it’s very inefficient at pulling fuel, always locate the
pump nearest to the fuel supply as possible. NEVER INSTALL IN THE ENGINE BAY.

http://www.mr-gasket.com/pdf/12S_42S.pdf


Not stated is the need to keep the pump wet. From my experience and discussion with Mr. Gasket tech - do not run dry! If you go to the link you will find an illustration which suggests an 45 degree up mounting arrangement. Seems this would tend to keep fuel in the pump even at a very low fuel level.

Good luck!

[Powerabout]

Where do you go for a pump that is rated for marine use as in USCG and UL approved?
Anyone know who made the pump for the SST engines?

[Detroit Whitey]

i have been running a BRP fuel pump for years no issues still going

[Powerabout]

Thanks Detroit W
I found this 388444 but obsolete? Was it the Holley one?
Got a number?



I forgot to mention the sst60 manual does a fuel flow test...

They say put 1 main jet of your engine into the outllet of your regulator so you can set the pressure to 4-6psi?
EDIT> Also found this 3854620 the stern drive low pressure electric?
anyone ussed one of these?

[formeone]

haa guys,,, want to ask a question,,,was your stock/old fuel system dropping off that much at wide open throttle... did ya test it?? ie pressure check.. before trying the new pumps etc????...

[Tim Kurcz]

haa guys,,, want to ask a question,,,was your stock/old fuel system dropping off that much at wide open throttle... did ya test it?? ie pressure check.. before trying the new pumps etc????...

All should be aware the factory diaphram fuel pump was designed with stock porting and exhaust. I didn't instrument until way too many pistons were sacrificed. That's why you see two pumps on all my manual start engines.

[Phil McDaniel]

I HAVE .020's, .030's &.040's LEFT. I HAVE SOME NEW RODS AND JUST ORDERED 30 SETS OF WRIST PIN BRGS. TODAY( 8/5). MOSTLY 20&40'S THOUGH. DON'T KNOW WHEN THE NEXT ORDER WILL BE IF EVER.

RODS HAVE BEEN GROUPED IN LOTS OF 3(WITHIN ONE GRAM WEIGHT).

850----- YOU CAN RUN THESE IN ANY 49 BLOCK. WOULDN'T ADVISE THE 2 INTAKE PORT 55 H.P. BUT ALL THE OTHERS (SOME 60,ALL65,70,&75 MOTORS) WILL WORK.

LET ME KNOW IF I CAN HELP--------------- THANKS PHIL 843-446-7767 cell

[wolfgang]

All should be aware the factory diaphram fuel pump was designed with stock porting and exhaust. I didn't instrument until way too many pistons were sacrificed. That's why you see two pumps on all my manual start engines.

Tim - do you know of any small ELECTRIC (for remote mounting) fuel pressure gauge with a range up to 5 psi? I want to use 2 crankcase pressure operated pumps on a 4-cyl Force to independantly feed 2 large OMC 2barrel carbs. rgds Wolfgang

[Tim Kurcz]

Wolfgang & others,

The best value is still the Mr. Gasket 12S micro vane pump. It delivers 4-7PSI @ 32 GPH using only 2A (12V). Mr Gasket tech explains it is a pusher pump, not designed to pull. Be sure to mount it low and do not let it run dry. Good luck!

PS It's always best to use an adjustable fuel pressure regulator. Delivery from any electric or diaphram pumps you use should be checked at peak RPM with cockpit mounted guage (even if temporary). I'm using the Mr. Gasket 0-15 PSI liquid filled guage - unable to find anything smaller for reasonable $$$.

Tim

[wolfgang]

Thank you Tim.I am not familiar with that gauge. Have you got a part no.? Does that mean you "plumb"
a 4mm pipe from near the carbs all the way to the steering wheel? rgds Wolfgang