HOLIDAY ALERT

We will be closing at 12 PM EST on Friday, April 18th, in observance of Good Friday and Easter.
Any orders placed after this time will be processed on Monday, April 21st.
Have a happy Easter weekend!

Weather Closure Alert

Due to severe weather, our White House, Tennesee location will be closed Wednesday the 19th.

All shipments from this location will resume on Thursday the 20th. Thank you for your patience!

WE WANT TO HEAR FROM YOU!

We strive to make improvements that make it easier to serve your boating needs.
We’d like to know more about you and how we can do the best job possible for you.
Please take the time to complete this brief 3-5 minute survey to help us serve you better.

FREE Ground Shipping on Orders over $100!  Exceptions apply - see details.

Toggle Nav
  • Sign In
  • Create an Account
My Cart
Search
Menu
Account
Settings
Inboard & I/O Engine Parts

Inboard Marine Engine Parts and Accessories

As the largest online dealer of inboard boat parts, Marine Parts Source will help you find the right engine parts you need for any project. We’re here to assist with seasonal maintenance, major repairs and more so you can get back on the water. Use our convenient categories to browse our collection — or if you know the part number you need, enter it into the search bar. From oil and fuel filters to spark plugs, exhaust manifolds, bell housings, starters and alternator belts, we supply boat owners from coast to coast.

You can always count on quality and knowledge when you shop with us. We’re an authorized dealer of the leading OEM and aftermarket performance inboard marine brands, including J&N Electric, Sierra, Arco Marine, Volvo Penta and Crusader. If you have a question, our sales associates have the technical expertise to answer it. Enjoy free ground shipping on qualifying orders so your vessel is ready for adventure.

Inboard & I/O Engine Parts

Items 1-12 of 584

Set Descending Direction
View as List Grid
Page
  1. Delco EST Conversion Kit GM V8 SIERRA 18-5514
    Delco EST Conversion Kit GM V8 | SIERRA 18-5514
    SIERRA-18-5514
    Qty In Stock: 21
    Brand: Sierra

    Delco EST style ignition conversion kit for upgrade or replacement on GM V8 small block and big block engines.

    Learn More
    MSRP: $762.59 $480.41
    Add to Wishlist
  2. Sierra 18-7282 Mercruiser GM 4 Cylinder Fuel Pump
    Mercruiser Mechanical Fuel Pump | Sierra 18-7282
    SIERRA-18-7282
    Qty In Stock: 28
    Brand: Sierra

    Carter style mechanical fuel pump for Mercruiser GM 2.5L & 3.0L 4-cylinder marine engines.

    Learn More
    MSRP: $196.99 $141.75
    Add to Wishlist
  3. Sierra 116-254-4000-1 4 inch Exoflex Exhaust/Water Hose, sold per foot
    4 inch Exoflex Exhaust/Water Hose, sold per foot | Sierra 116-254-4000-1
    SIERRA-116-254-4000-1
    Qty In Stock: 47
    Brand: Sierra
    Features a corrugated exterior and is internally reinforced by wire to prevent hose from collapsing. Primarily used for connections in marine wet exhaust and engine water circulation applications, especially where significant bends of hose are required. Designed to resist heat, exhaust gases, ozone, antifreeze, and saltwater Learn More
    MSRP: $37.68 $31.40
    Add to Wishlist
  4. Small Image
    Fuel Filter Element & Canister | Sierra 18-7861
    SIERRA-18-7861
    Qty In Stock: 63
    Brand: Sierra
    Aftermarket replacement fuel filter & canister used on many early model Crusader & OMC marine engines. Learn More
    MSRP: $37.49 $24.98
    Add to Wishlist
  5. Sierra 116-254-3000 Exoflex Hose
    3 inch Exoflex Exhaust/Water Hose, sold per foot | Sierra 116-254-3000-1
    SIERRA-116-254-3000-1
    Qty In Stock: 138
    Features a corrugated exterior and is internally reinforced by wire to prevent hose from collapsing. Primarily used for connections in marine wet exhaust and engine water circulation applications, especially where significant bends of hose are required. Designed to resist heat, exhaust gases, ozone, antifreeze, and saltwater Learn More
    MSRP: $24.59 $23.21
    Add to Wishlist
  6. Sierra 18-1953-2 Mercruiser GM Small Block Exhaust Manifold
    Mercruiser GM Small Block Exhaust Manifold | Sierra 18-1953-2
    SIERRA-18-1953-2
    Qty In Stock: 120
    Brand: Sierra
    Center rise exhaust manifold fits Mercruiser GM 5.0L & 5.7L CID marine engines. Learn More
    MSRP: $232.19 $205.15
    Add to Wishlist
  7. Small
    GM Marine Distributor | Sierra 18-5313-1
    SIERRA-18-5313-1
    Qty In Stock: 1
    Brand: Sierra

    Sierra Mallory breaker point style distributor for GM small and big block marine engines

    Learn More
    MSRP: $588.99 $376.69
    Add to Wishlist
  8. Sierra 18-1976-2 Mercruiser 4 in. Center Rise Exhaust Elbow
    Mercruiser Center Rise Exhaust Elbow | Sierra 18-1976-2
    SIERRA-18-1976-2
    Qty In Stock: 77
    Brand: Sierra

    Sierra direct replacement exhaust elbow fits many Mercruiser V6 & V8 marine engines with center rise exhaust manifolds. 4-inch outside diameter exhaust hose connection

    Learn More
    MSRP: $208.69 $129.72
    Add to Wishlist
  9. Sierra 18-8860 Mercruiser GM Big Block Fuel Pump
    Mercruiser Mechanical Fuel Pump | Sierra 18-8860
    SIERRA-18-8860
    Qty In Stock: 31

    Sierra aftermarket mechanical fuel pump for Mercruiser 7.4L & 8.2L marine engine applications. Includes the engine mounting gasket.

    Learn More
    MSRP: $219.89 $159.69
    Add to Wishlist
  10. Sierra 18-8115 Flexible Fuel Line USCG Approved - 25 in.
    Flexible Fuel Line USCG Approved - 25 in. | Sierra 18-8115
    SIERRA-18-8115
    Qty In Stock: 38
    Brand: Sierra
    Flexible fuel line is designed for fuel pump to carburetor connections of marine engine. Learn More
    MSRP: $82.09 $52.42
    Add to Wishlist
  11. Large Image
    10 Micron Long Fuel Water Separator Filter | Sierra 18-7945
    SIERRA-18-7945
    Qty In Stock: 204
    Brand: Sierra
    Replacement spin-on fuel filter fits many Mercury & Mercruiser marine engines to remove contaminants & water from incoming fuel. Learn More
    MSRP: $8.99 $6.10
    Add to Wishlist
  12. Delco EST Conversion Kit 4.3L GM V6 | Sierra 18-5513
    Delco EST Conversion Kit 4.3L GM V6 | Sierra 18-5513
    SIERRA-18-5513
    Qty In Stock: 26
    Brand: Sierra

    Delco EST style ignition conversion kit for upgrade or replacement on 4.3L GM V6 engines.

    Learn More
    MSRP: $795.19 $500.93
    Add to Wishlist

Items 1-12 of 584

Set Descending Direction
View as List Grid
Page
My Wish List
Last Added Items
  1. Add to Cart
    Remove This Item
Go to Wish List
You have no items in your wish list.
© 2025 Marine Parts Source. All Rights Reserved.