DIY fuel return restrictor/pressure increase? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 04-08-2007, 06:49 PM   #1
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Default DIY fuel return restrictor/pressure increase?

Just wondering if anyone here had come up with/tried a DIY fuel pressure increase by restricting the return line.....

It made sense to me that you could place a small flow restrictor (such as perhaps a small metal shaft that had been centre drilled) inside the fuel hose on the return line. You could hold it in place with a hose clamp, and is would effectively reduce cross sectional area inside the hose, increasing fuel line pressure.....

Or would it be negated by the stock FPR????

I don't know the maths off the top of my head, but is there anyone here who could work out how much reduction in CSA you would need?

There is a similar small white plastic restrictor inside the hose on the tapped cover breather hose.... that's what made me think of it.........
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Old 04-08-2007, 07:56 PM   #2
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Just buy a afpr man, there cheap.
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Old 04-08-2007, 08:56 PM   #3
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it will raise the fuel pressure but it won't be adjustable, you'll have way too much fuel pressure at idle. start you car and squeeze the return line and you'll see
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