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I have a little ranger race truck and switched to a fuel cell.  The fuel pump quit working the first week.  I was told it is because I hard wired it and that it needed a relay to work properly.  I also have my fan hardwired and was told I needed a relay with that also.   I have had many fans hardwired and never had an issue, and was thinking previous fuel pumps I had were also. 


So is it true.  Do I need a relay for fan and pump for them to work properly?   And if so is there some sort of inline relay I can wire in?


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