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By Sarge McCoy
PUMP UP MY FUEL PUMP
I have a 2012 Polaris Sportsman 400
that I bought new. It has 274 miles on
it, and I am putting the third fuel pump
on it. Polaris says they haven’t heard of
any problems with the pump. My local
Honda dealer said ethanol in the fuel
is destroying the pump. He suggested
I should use a fuel additive to combat
the effects of ethanol. What do you
think? Is there a better pump available?
I’ve been riding for 42 years and never
had this problem. Please help this old
Moon Township, Pennsylvania
Private Cutesy, I find it hard to
believe the Polaris fuel pumps are
failing due to ethanol fuel. If that were
the case, I would reasonably expect
to see tens of thousands of failures
all across the country. Was the exact
cause of the failures ever determined
for each pump failure? If you can get
the pumps back from your motor pool,
or you still have them, then I would be
interested in seeing what caused each
failure. Disassemble the pumps and
look for dirt/rust inside. Also, check the
diaphragms for holes or deformations.
Finally, check the check-valve discs.
If any debris gets between the discs
and the pump body, the pump won’t
pump fuel. The fuel pump is simply
a low-pressure, 1–3-psi fuel pump,
so anything would work that runs on
12 volts and the correct pressure
specifications. Do some recon, Private
Cutesy, or you will be walking the
perimeter on guard duty for the next
I LIKE MY
I love to read your
section, and in the
February edition I saw
a guy having a problem
tires. Well, I live in
Minnesota and do a
lot of ATV repair work
and have run into this
problem more than I
wish to think of. When
St. Paul, Minnesota
Private Quonset, thank you for the
tip. However, as I stated back in the
February issue, it will still help to get the
tires “stinky” hot to ease installation and
SHIFTLESS IN MICHIGAN
I’m having issues with shifting gears
on a 2013 John Deere Trail RSX850i.
At times when I go to change gears
from high to reverse, it won’t come
out of gear and/or go into gear. This
also happens when changing from
high to low gear, and sometimes it
will grind gears and not go into gear.
When any of the above happens, I shut
the machine off, change gears, then
restart the engine. This is an intermittent
problem. Thank you.
Private Ten-hut!, 2013 John Deere
Trail RSX850i’s had a PIP (Product
Improvement Program) on the shifter
and linkage. I am surprised your dealer
isn’t aware of this! Make him aware,
Boot! That is an order. They need to fix
this before you grind your transmission
into powdered steel! Laugh, Boot! Also,
I have heard where some owners had
both primary and secondary clutches
replaced to solve the shifting problem.
In any event, Boot, John Deere will
fix your problem for free. Twenty-five
push-ups in the mud for putting up with
this situation! Dismissed!
MY FUEL PUMP IS
I own a 1987 TRX350 Foreman. I had
a problem with fuel flow, so I replaced
the fuel-pump relay and it started right
up, but the next day the same thing
happened. If I jump the relay, the fuel
pump runs. But, Sarge, it is a brand-
new relay. Can you help?
Private Gumball, there is always the
possibility of a NIB (New In Box) relay
being bad. However, we need to do
some basic circuit checking. When you
turn the ignition switch on, can you
hear the fuel pump running for about
five seconds? “Yes” means your fuel
flow to the pump is partially plugged.
Start at the fuel tank and work your
way down to the fuel pump looking for
a blockage. “No” means no power is
getting to your pump. Disconnect the
wires at the fuel pump and look for 12
volts when you try to start the Zooter.
“No 12 volts” means the problem is
“upstream” electrically. “Yes” means the
fuel pump is bad. Since you “jumped”
the relay and it worked , I will assume
the relay works. Next, disconnect the
relay connector and measure voltage
between the BL/Y and G wires. When
starting the Zooter, you should read 12
volts. If yes, then the new relay may be
bad. If no, then we go upstream further.
Disconnect the relay connector from
the CDI and check the resistance of the
BL/Y wire back to the fuel-pump relay.
It should read almost 0. If yes, then
your problem is most likely the CDI. If
no, then repair or replace the wiring
because power from the CDI is not
getting to the fuel-pump relay to turn on
the fuel pump to feed the carburetor.
Gravity and a fuel tank positioned above
the carburetor seems much simpler at
this point, doesn’t it Private Gumball?
Laugh, Boot! Get this fixed ASAP or
you will be getting plenty of PT pushing
your “dead” Foreman back to the motor