857005A1 Fuel Pump Diaphragm Kit For Mercury Marine Outboard/Sport Jet Engines
857005A1 Fuel Pump Diaphragm Kit For Mercury Marine Outboard/Sport Jet Engines
Fuel Pump Diaphragm Kit
Premium Diaphragm Kit for Mercury Marine & Compatible Engines - 30-250 HP
Product Details
High-quality fuel pump diaphragm kit designed for Mercury Marine outboard and Sport Jet engines. Also compatible with Chrysler Force, US Marine, and Sea Ray engines. Ensures reliable fuel delivery and optimal engine performance.
APPLICATION: This guide is to be used as a reference only. You must verify fitment using your model or serial number.
Package Contents
1 × Diaphragm Kit
(Contains all parts shown in picture)
Key Features
- Premium diaphragm material
- Direct replacement
- Wide compatibility
- Reliable performance
OEM Part Numbers
Replaces These OEM Numbers:
- 21-42990A1
- 21-42990A10
- 21-42990A11
- 21-42990A2
- 21-42990A3
- 21-42990A4
- 21-42990A5
- 21-42990A6
- 21-42990A7
- 21-42990A8
- 21-42990A9
- 21-857005A1
- Sierra: 18-7817
Important Installation Note
To find the right part for your outboard, it is VERY IMPORTANT to verify outboard model or serial number before purchase. You can leave us message e.g. your outboard engine parts model, serial number, horsepower or year if you are not confirmed this part fits your outboard motor or not. We're pleasure to help you.
Before You Buy
Please verify your engine model and serial number before purchase. Contact us for fitment confirmation. Free worldwide shipping from XRmarine.
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Before You Buy
Frequently Asked Questions
What is your refund policy?
We offer a 14-day hassle-free return on all products. Items must be unused and in original packaging. Every XRmarine part is also covered by our 1-year warranty against manufacturing defects. If something is not right, email us at info@xrmarineparts.com — replacement or full refund, your choice.
See our full Refund Policy for complete details.
How does shipping work?
Free international shipping on every order — no minimums. We ship from our global warehouse network (US, Germany, UK, Australia). Typical delivery: 10-20 business days. Tracking included.
See our full Shipping Policy.
How do you keep prices fair?
We cut out the middlemen. XRmarine sources directly from quality manufacturers and sells at honest prices. Same OEM-quality parts, no dealership markup. Every order comes with free shipping, real expert support, and a 1-year warranty.
Learn more on our About Us page.
What payment methods do you accept?
We currently accept PayPal — a fast, secure way to pay online. Credit card payments (Visa, Mastercard, American Express) and Shopify Payments are being set up and will be available soon. We appreciate your patience.