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Re: A '54 named Busty
there are two types of returnless systems, the early had the FPR at the fliter so it was only returnless at the engiine, there was a return at the rail. in 2005?ish the returnless moved the filter and FPR to the tank pump, and added a fuel pressure sensor there so the PCM could modify pressure based on load. if that means you need some type of regulator, I have no idea, I havent swapped one, only worked on the two different systems as stock.
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