Question for those of you who may own a 99 and 00 busa

ky busa

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Had to replace a fuel line on my oem fuel pump assembly. There is a large piece of foam about 1/2 in thick that sits over fuel pump assembly. What is its purpose help keep heat off fuel pump assembly? Should i put it back or leave it out? 1999 busa 18,500 miles
 
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