571504: FLAME, Mercruiser | $21.95

571504 Comparison

571504 in Used Condition
photo	price	summary	rating
Details	$21.95	Condition is Used, W5b FLAME ARRESTOR MERCRUISER 571504 Barbron, shipping cost = $10.00	99.9%
Details	$30.00	Condition is Used, Mercruiser flame arrestor 571504, shipping cost = $18.24	99.4%
Details	$27.00	Condition is Used, Mercruiser 571504 Flame Arrestor, shipping cost = $150.00	99.8%

The Mercruiser 571504 Flame Arrestor is an essential safety component for marine engines, specifically designed to prevent the backflow of fuel into the combustion chamber during normal engine operation and in the event of a fire. This flame arrestor is engineered to meet the stringent requirements of the United States Coast Guard (USCG) and is suitable for use with both gasoline and diesel fuel.

The flame arrestor is constructed from high-quality materials, including a durable aluminum housing, a porous ceramic filter, and a stainless steel screen. The ceramic filter is designed to allow the proper flow of air and fuel while effectively preventing the backflow of fuel vapors or flames. The stainless steel screen provides an additional layer of protection against debris and contaminants that could potentially clog the filter.

The Mercruiser 571504 Flame Arrestor features a compact and sleek design, making it easy to install and integrate into various marine engine applications. It is designed to fit Mercruiser and Mariner engines with part numbers 3.0L, 4.3L, 4.3B, 5.0L, 5.7L, and 6.2L. The arrestor is also compatible with both carbureted and fuel-injected engines.

Installation of the flame arrestor is a straightforward process that can be completed by a qualified marine mechanic or an experienced do-it-yourselfer. The arrestor comes with a detailed installation manual and all necessary hardware to ensure a secure and proper installation. Additionally, the flame arrestor is covered by a one-year warranty, providing peace of mind and protection against manufacturing defects.

In summary, the Mercruiser 571504 Flame Arrestor is a critical safety component for marine engines, designed to prevent fuel backflow and protect against the risk of engine fires. Constructed from high-quality materials and engineered to meet USCG requirements, this flame arrestor offers reliable protection for both gasoline and diesel engines and is easy to install with the included installation manual and hardware.

The Mercruiser 571504 Flame Arrestor is a crucial component in the ignition system of Mercruiser engines, designed to prevent the backflow of fuel into the engine intake and prevent the possibility of an explosion. Here are some pros and cons of buying this flame arrestor:

Pros:

1. Safety: The primary function of a flame arrestor is to ensure the safety of the engine and the operators by preventing fuel backflow and potential explosions.

2. OEM Part: This flame arrestor is an original equipment manufacturer (OEM) part, which means it is designed, manufactured, and tested by Mercruiser, ensuring compatibility and reliability.

3. Improved Performance: A properly functioning flame arrestor can improve engine performance by allowing the engine to breathe more efficiently and burn fuel more effectively.

4. Easy Installation: The Mercruiser 571504 Flame Arrestor is designed for easy installation, and replacement is a straightforward process that does not require extensive mechanical knowledge or specialized tools.

Cons:

1. Cost: This flame arrestor may be more expensive than aftermarket alternatives, which could be a consideration for budget-conscious consumers.

2. Availability: Depending on the location and availability, it may take some time to source and receive this flame arrestor, which could delay repairs or maintenance.

3. Single Use: This flame arrestor is designed for one-time use and should be replaced after every fuel filter change, which could add to the ongoing cost of ownership.

In conclusion, the Mercruiser 571504 Flame Arrestor is an essential safety component for Mercruiser engines that ensures safe and efficient operation. While it may be more expensive than aftermarket alternatives, the peace of mind and reliability it provides make it a worthwhile investment for boat owners.

Recommendation: If you own a Mercruiser engine and are in need of a new flame arrestor, we recommend purchasing the Mercruiser 571504 Flame Arrestor to ensure compatibility, reliability, and safety. Regularly checking and replacing the flame arrestor according to the manufacturer's recommended intervals is also essential for maintaining the overall performance and longevity of the engine.

Details:

specifications inboardfuel:

brand: Mercruiser
mpn: 571504
part type: Flame
country of origin: United States
california prop 65 warning: Warning

seller inboardfuel:

# reviews: 28423
rating: 99.8%
city: burley, idaho

payments inboardfuel:

wallet: apple-pay
credit card: mastercard
other

returns inboardfuel:

time: 30 days
policy: returns accepted
paid by: seller

offer inboardfuel:

prices: $21.95–$30.00
item condition: Used
availability: in stock
sold #: 6
started: april 25, 2026
options: ship-to-home
in stock #: 3
best offers: true

general inboardfuel:

category: Boat Parts > Inboard Engines Components > Intake Fuel Systems

shipping inboardfuel:

carrier: ups
service: economy, ups ground, standard
type: fixed
transit: 4-10 days
class: economy, standard

rating: 99.8% out of 100 based on 423 user ratings.