FORM 12S42S 11/12
INSTALLATION INSTRUCTIONS
O.E. REPLACEMENT (MICRO) ELECTRIC FUEL PUMPS
Mr. Gasket Part No. 12S and 42S
READ ALL INSTRUCTIONS CAREFULLY BEFORE BEGINNING INSTALLATION. RECOMMENDED FOR ORIGINAL EQUIPMENT REPLACEMENT
AND NEGATIVE GROUND SYSTEMS ONLY. NOT FOR USE WITH FUEL INJECTED SYSTEMS, HIGH PERFORMANCE OR MODIFIED ENGINES,
AIRCRAFT OR MARINE APPLICATIONS OR DIESEL FUEL. A FUEL PRESSURE REGULATOR IS HIGHLY RECOMMENDED.
GENERAL INFORMATION
The Mr. Gasket (Micro) Electric Fuel Pumps #12S and #42S
are gravity feed pumps designed for original equipment
replacement on carbureted cars, trucks, industrial equipment and farm equipment, including lawn and garden. It
also works for fuel transfer systems in gasoline applications
as well as a booster pump for an existing mechanical fuel
pump. Pump is self-priming, with a two bolt and two wire
installation. Average 2 amp draw at maximum delivery.
#12S is a universal design for most domestic 4, 6 and 8
cylinder carburetor applications. Operating fuel pressure
range for #12S is 4 – 7 PSI and flow is 35 GPH.
#42S is a universal design for most import 4 and 6 cylinder carburetor applications. Operating fuel pressure
range for #42S is 2 – 3.5 PSI and flow is 28 GPH.
MOUNTING PROCEDURE
Step 1
Make sure the fuel tank is very close to empty. Drain if
needed. Inspect the current fuel line – if it is cracking,
replace it with a new fuel rated hose. Install supplied
in-line filter to prevent small particles from entering the
pump. We highly recommend installing a filter as well
between the carburetor and fuel pump to prevent small
particles from entering the carburetor. If you choose to
no longer use your mechanical fuel pump, make sure
to install a block-off plate or plug the pump inlet and
outlets. All fuel line connections should be leak-proof.
Step 2
Mount the pump about 12” from the fuel tank and as
close to the lowest level of the tank to ensure proper
fuel supply. Refer to Figure 1. Make sure mounting
area is clean of all rust, paint and grease.
Step 3
Using 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 mount the pump in
a location that allows you to add the safety nuts provided.
Install the supplied filter in the pump inlet and install
outlet fitting using thread sealer and tighten to 10-ft-lbs.
NOTE: Never install pump in engine compartment.
Step 4
Attach the hose to the inlet side of the supplied filter using automotive quality hose clamps. Some tank outlets
may have 3/8” instead of the supplied 5/16” fittings.
You may need to purchase one 3/8” barb x 1/8” NPT
x 3/8” length. If using 3/8” fitting, you may need to
purchase a 3/8” filter. DO NOT USE PUMP WITHOUT
A FILTER. Install the correct size fuel line from the outlet
port on the fuel pump to the factory metal fuel line going
to the engine bay. If no fuel line exists, fabricate a hard
line from the pump to the engine compartment. NOTE:
Never run rubber fuel line from the rear of the vehicle
to the front. Always minimize use of rubber hose.
When possible, use steel hard line.
FIGURE 1:
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Step 5
Make sure to use the red lead for 12 Volt power (fused 5
amp max) and the black lead for ground. The red positive
lead needs to be connected to the switched ignition
terminal. Use a 5 amp fuse or in-line fuse holder. Use only
automotive grade electrical cable - minimum 16 gauge.
If wire is run over 20 feet, use 14 gauge. Ensure that all
connections are secured and sealed from the elements.
NOTE: This pump is for negative ground systems only.
Step 6
Inspect and tighten all connections before start up. Turn
the key to the on position to prime, and leave on for 10
seconds, then turn off. Inspect for fuel leaks. If leaks are
present, re-tighten clamps and restart. Let the vehicle run
for several seconds, then turn off and re-inspect for leaks.
Check pump and fuel line connections every 5,000 miles.
QUESTIONS
Please call our Tech Support line at 1-216-688-8300,
M – F, 9 – 5 EST. Please have the part number on hand
when you call.
MR. GASKET LIMITED NINETY (90) DAY WARRANTY
Mr. Gasket which includes ACCEL, Hays, Lakewood,
Mallory and Mr. Gasket product lines, warrants its products only to the original purchaser at retail to be free from
defects in material and workmanship for a period of 90
days from the date of original retail purchase, except that
the following products have longer warranty periods:
WHO IS COVERED:
The warranty extends to original purchaser at retail only,
with a proof of purchase.
WHAT IS COVERED:
All parts which are defective in materials or workmanship
on original installation only, subject to the following:
WHAT IS NOT COVERED:
1. Products which have been subjected to abuse, accident, alteration, modification, improper installation, improper operational adjustments, tampering, negligence,
misuse, or if repaired or serviced by anyone other than
Mr. Gasket.
2. Actual or alleged labor, transportation or other incidental charges.
3. Actual or alleged consequential damages incurred by
use of this product.
WHAT WE WILL DO:
Mr. Gasket at its election, will either repair or replace all
defective parts free of charge.
WHAT YOU MUST DO FOR THE WARRANTY SERVICE:
In the event that the original purchaser detects a
defect in the material or workmanship, the product(s)
in question must be returned by the original retail purchaser to the place of original purchase for warranty
determination. In the event that the purchaser does not
receive satisfaction from the place of original purchase
or in the event there are any questions with regard to
this limited warranty, please contact the Technical
Service Dept., Mr. Gasket, 10601 Memphis Ave., #12,
Cleveland, OH 44144, or call (216) 688-8300 ext. 5.
Do not send alleged defective parts to Mr. Gasket
without prior approval to do so. If such approval is
obtained, the defective part and proof of purchase
should be sent, postage prepaid, to Mr. Gasket, at the
above address.
NO OTHER WARRANTY, EXPRESS OR IMPLIED, IS
APPLICABLE TO THE PRODUCTS OR MR. GASKET.
THE DURATION OF ANY IMPLIED WARRANTIES,
INCLUDING THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE, IS LIMITED TO THE DURATION OF THE
EXPRESS WARRANTY HEREIN. MR. GASKET SHALL
NOT BE LIABLE FOR THE LOSS OF USE OF THE
PRODUCT, INCONVENIENCE, LOSS OR ANY OTHER
DAMAGES, DIRECT OR CONSEQUENTIAL, ARISING
OUT OF THE USE OF, OR INABILITY TO USE,THE
PRODUCT OR FOR ANY BREACH OF ANY EXPRESS
OR IMPLIED WARRANTY, INCLUDING THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE APPLICABLE TOTHIS
PRODUCT.
Some states do not allow the exclusion or limitation
of incidental or consequential damages or limitations
on how long an implied warranty lasts, so these limitations or exclusions may not apply to you. This warranty gives you specific legal rights and you may also
have other rights which vary state to state. Materials,
components, specifications, colors, model changes,
availability and prices are subject to change without
notice or obligation. Manufacturers’ brand names,
trademarks and registered trademarks are used for
reference only and are not to imply that any product is
of their manufacture or any association herewith. Mr.
Gasket, makes no representation or warranty, express
or implied, that its products comply with local, State
or Federal emission levels, noise levels or safety standards. The purchaser assumes all responsibility for
such use and compliance.
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