Sierra
Sierra 18-7817 Diaphragm Fuel Pump
Price: $12.73
Save: $4.76
(27% Off $17.49)
Part # 18-7817
2nd Day Air for $2 More Eligible
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This item is found in the following Product Families
Replaces OEM part #
  • MERCURY MARINE 21-42990A7
  • MERCURY MARINE 21-42990A8
  • MERCURY MARINE 21-857005A1
Average Customer Review for Sierra 18-7817 Diaphragm Fuel Pump
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Fuel pump kit for a 40 hp Force outboard
by Truman from Murfreesboro, Tennessee on September 17, 2016
Kit was fast shipping and the kit was as stated in their parts list. I talked to a service rep. before ordering to make sure the kit was for my motor. They were very nice and I will be buying from I Boats as I need parts. Happy customer in TN.
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Rebuild kit
by Kevin from Ethel, Mississippi on August 31, 2016
Everything needed to rebuild your fuel pump
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Fine product, very poor support
by Joshua from Fitchburg, Wisconsin on July 06, 2016
I ordered this part along with a manual about a week before a fishing trip. The manual arrived in perfect condition, but the part was not in the package. I submitted a request for assistance online which was never, ever replied to. I further called and was told it was too late in the day and someone would get back to me the day after nobody called or emailed. So I ordered the part again with urgent shipping and got it just in time to do the repairs needed, but I had to pay for it TWICE and expedited shipping TWICE and I still haven't heard from iboats about it. I'll look elsewhere for parts in the future.
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Exactly what I needed.
by Bradley from Hannibal, Missouri on July 04, 2016
Good product, quick delivery!
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Fuel Pump rebuild kit for 1994 mercury 40hp outboard
by Gregory from Fayetteville, Arkansas on June 15, 2016
The kit arrived in just a few days and I installed it in about 15 minutes. It works well.
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Looking good
by a Customer from Glasgow, Montana on June 14, 2016
No problems thus far. Everything worked great and was included in packaging.
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Fuel pump rebuild kit
by Marcel from Henrico, Virginia on May 29, 2016
Fits great, works great. Great price.
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Works great
by Ray from Lake St. Louis, Missouri on April 07, 2016
With the use of YouTube replacement was very simple. The new diaphragm kit solved my stalling problems.
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Good quality
by Clayton from Munford, Tennessee on March 08, 2016
Good well priced parts shipped quick
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fuel pump kit
by Lonnie from Cooleemee, North Carolina on January 02, 2016
Anytime you need boat parts check with iboats first.the product is always the right one and the service is great.prices are good to
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Force fuel pump kit.
by Arnold from Cedarburg, Wisconsin on October 19, 2015
It works. a small diagram showing the order of assembly would be a plus.
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Great product
by Brandon from Pottsville, Pennsylvania on September 28, 2015
Totally complete kit, easy install
(1 of 1 people found this review helpful)
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Diapgragm Fuel Pump
by David from Friendswood, Texas on July 19, 2015
Thia kit was vey easy to install.
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Sierra 18-7817 diaphragm fuel pump rebuild kit
by Edward from Freeport, Pennsylvania on June 04, 2015
Everything needed to do the rebuild except instructions. Fortunately, I still had the instruction sheet that came with a Mercury kit from 23 years ago.
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Perfect Solution
by Ron from Saugus, California on May 30, 2015
Your rebuild kit worked perfectly and saved me hundreds of dollars. Just watched a utube and your kit and now my Merc 115 runs like new. Pretty easy took an hour of procrastination and 30 minutes of work..
(0 of 1 people found this review helpful)
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diaphram fuel pump 18-7817-sierra
by John from Deerfield Beach, Florida on May 25, 2015
i found you out from a u tube video on how to rebuild my fuel pump . everything was alright and i was able to complete the job myself which saved me allot of money. my only problem was with the "I" gasket shown on the bottom of your pic of parts shown to my left. As i was installing it somehow it fell and when i picked it up i noticed it was torn.It was made of some type felt like material ,which to me, seemed kind of flimsy for a gasket. my old one seemed intact and made of a rubber like material that was obviously much stronger. This also gave me some doubt about the overall integrity of the product.However,my boat is running fine and thank you for making this product available. John A. Ladkani
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Fuel Pump Kit
by Jeffery from Cincinnati, Ohio on July 10, 2014
Right parts , easy repair to do and works great ! Very Happy .
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be careful
by Donald from San Antonio, Texas on May 30, 2014
was fairly easy to repair pump. thank god i didnt destroy the nylon valve retainers. the ones in the kit both broke. kind of flimsey. the rest of the kit appeared to be of good quality.
(2 of 2 people found this review helpful)
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Excellent Product
by Dawn from Kelso, Washington on April 15, 2014
Kit was easy to install, pretty self-explanatory. Engine was constantly losing it's prime, not idling, and running bad. Runs great now, no problems.
(2 of 2 people found this review helpful)
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Mercury fuel pump kit
by Kris from Ragley, Louisiana on March 14, 2014
Nice materials and easy to install
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HIGHLY RECOMMEND
by Johnny from Lake Cormorant, Mississippi on November 27, 2013
THIS KIT IS EXACTLY THE SAME AS THE KIT THAT HAS MERCURYS NAME ON IT
(1 of 1 people found this review helpful)
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von
by Hilery from Tallahassee, Florida on September 23, 2013
I'm very pleased. Keep up the good work. I have found a place to get all my outboard motor parts. I'll be back.
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Worked perfectly...better than original
by Ronald from LeRoy, Illinois on September 02, 2013
These parts fit perfectly.....a little bit heavier duty than the original. Every phase of iBoats is first class.
(1 of 1 people found this review helpful)
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bad nylon pin ancors
by Michael from Coon Rapids, Minnesota on May 28, 2013
nylon pin were cheap busted very easy whent an used old ones
(2 of 2 people found this review helpful)
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Good Service
by Ronald from Greenville, Ohio on August 10, 2012
Received parts in a timely manner and they solved my problem with the motor.
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Perfect
by Noel from Orlando, Florida on July 23, 2012
Rebuilt the fuel pump on my Mercury 40 Classic with this kit. It is a perfect replacment and match with quality parts. I even think the material used for the diaphragms are even better then OEM. Gaskets are high quality. No problems with the install, however, you will probably want to refer to a maintenance manual as the kit does not come with any instructions. Pretty straight forward nevertheless as long as you realize that you have to break off the little plastic pins on the leaf valve retainers and then press them back into the retainers to expand the retainers and lock thim in place.
(2 of 2 people found this review helpful)
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Fuel Pump Kit
by Edward from Salem, South Carolina on July 22, 2012
Kit had all pieces required and worked perfectly! Much cheaper than the Quicksilver part.
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Fuel pump kit
by Bill from Bell Buckle, Tennessee on July 03, 2012
Good kit. Missing gasket pictured in upper right. Had to reuse original. Highly recommend having manual because no instructions are supplied And if you get sidetracked like i did you wont get it together correctly. However pump works well
(1 of 2 people found this review helpful)
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Damaged
by Milton from Mcgaheysville, Virginia on June 16, 2012
Well Saturday is here, time to rebuild my fuel pump on my outboard. Everything out of the way, pump is off, disassemble, start rebuild, comes to a halt, one of the rubber diaphragms has 2 pin holes in it, of course I am told to call Sierra, if they say its bad then to call iboats and return for replacement. For a 12.00 kit, think not, waste of time ordered new one from someone else
(1 of 1 people found this review helpful)
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Great service
by Ronald from Matawan, New Jersey on April 29, 2012
Product was as described shipping was faster than indicated. Will use this seller again
(1 of 1 people found this review helpful)
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Wrong kit.
by Robert from San Gabriel, California on March 31, 2012
I ordered two different kits. Not sure which one was for my fuel pump I ordered them both to be safe. The one kit had all the parts I needed so I returned the other one and will order another one of the same that I used as a spare.(JUST IN CASE THE PROBLEM SHOULD ARISE AGAIN)Ha ha. I haven't had the boat on the water yet 'cause it's needing an advanced oil injector pump. She was neglected by her previous owner. As For my satisfaction with iboats.com,I am COMPLETELY SATISFIED!!
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Wrong kit
by Robert from San Gabriel, California on March 31, 2012
I ordered two different kits one of which had all of the parts I needed but I wasn't sure according to the picture foe certain parts so I ordered the other kit that pictured the parts that I would need to completely rebuild my fuel pump.Upon returning the kit I didn't use,I will order the first kit to have as a spare at hand.My satisfaction really wasn't thumbs down, what I ment by that is explained above. Completely satisfied R. Crouse.
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Fuel Pump Kit
by Deborah from Cleveland, Tennessee on September 17, 2011
Diaphragm and seals were all bad on my fuel pump... motor having a heck of a time trying to plane out and reving/jerking. Wouldn't idle. Fuel pump wasn't having enough pressure to suck the fuel through. Got this for $11 and rebuilt the pump (which is nothing to do) hooked up the lines to the pump and mounted it back to the motor. Took it out and the motor ran as good as new. Beats paying alot more for a brand new fuel pump all together. BTW, this is the only place online I could find this particular fuel pump kit, so thanks iboats...
(1 of 1 people found this review helpful)
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1996 Force 120 fuel pump repair
by Art from Bel Air, Maryland on August 11, 2011
easier than i anticipated, and, iboats was the only place i could find the kit
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Seems to be a good product
by Stephen from Starr, South Carolina on July 21, 2011
I have yet to install this item but seems to be quality.
(4 of 9 people found this review helpful)
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rebuild kit
by David from Brook Park, Ohio on July 14, 2011
I was very satisfied with the parts and delivery time.
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Fixed my problem
by Ken from Colorado Springs, Colorado on July 05, 2011
Had a Force engine spewing gas and the culprit was a pinhole in the fuel pump diaphragm. This kit fixed the issue.
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Fast Shipping
by KIM from Ville Platte, Louisiana on July 04, 2011
nice doing business
(1 of 1 people found this review helpful)
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Fixed one of my motor problems
by Ken from Colorado Springs, Colorado on June 28, 2011
Boat would not idle and there was excessive gas in the exhaust. Rebuilding the fuel pump fixed both problems.
(2 of 2 people found this review helpful)
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awesome
by Matt from Lexington, South Carolina on January 31, 2011
easy to install took about 30min and fast shipping thank you very much!
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Q:
Will this part work on my 2005 mercury 40hp? 2005 40elpto serial number 1B143204?
A:
Yes this will work for your motor.


Q:
I have a 1996 force 40 ELPT i wonder if this will also work?
A:
Yes this will work for your motor application.


Q:
Will this work on a 1991 Force 50hp outboard?
A:
No you need part number 18-7806-1.


Q:
Where can i find the installation instructions?
A:
You will need to refer to a repair manual, Sierra does not provide instructions. You can also contact a local technician from our professional installation tab.


Q:
I hope this is the right part ? hope its a sera # that is tthe merc # for the 21-857005a1?
A:
Well it cross references with 21-857005A1 if that's what you're asking. So if the OEM number to your fuel pump kit was 21-857005A1 then this will work.


Q:
Is item #18-7817 correct kit for 30 HP Mariner, 06447032?
A:
That's not a valid serial number from Mariner. It seems really close, but that second digit is usually a letter. Like 0G447032. Call us at the number at the top of the page with the serial number and we can match it up.


Q:
Does this kit work with fuel pump 98766?
A:
Yes this fuel pump kit will work for that.


Q:
1992 175xri kiT 42990a10 WILL 18-7817 WORK?
A:
Yes this kit will work for your engine.


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