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Siphon Pump Line Diameter

 
Old 10-11-2017, 10:03 AM
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Turpid porpoise
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Default Siphon Pump Line Diameter

Anybody know what size the tubes going to and from the Siphon Jet pump are? I've made my own orifice restrictor setup and just need to know what suze fuel line to AN adapters to get. My 3/8 adapter seemed to large so Im guessing 5/16 or even 1/4?

Any help is appreciated.
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Old 10-11-2017, 03:47 PM
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LTstewy8
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5/16" according to my notes. What's the story on this custom orifice? I couldn't find any info on the stock orifice size, but I stopped worrying about it since I've been running 3 bar fuel pressure for about 10,000 miles with no tank transfer issues.
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Old 10-11-2017, 04:13 PM
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Patches
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Here are instructions from RSI on how to make your own venturi.

Buy a -6 AN Y adapter. Tap one of the legs and install a set screw in it. Drill a small (5/64) hole through the middle

The plumbing is fairly basic. You have 2 feed ports on the hanger and 2 return ports. Just make sure you know which ones are which before installing it into the car.

You come out of the hanger with -6 AN lines. You install your Y block in one of the feel lines and the restricted leg of the y will be connected in to the feed line side leading to the passenger tank. This should be the smaller of the hardlines. The other leg of the Y along with the uninterrupted -6 feed line will go to feed you fuel rails. Plumb one of the return ports to the regulator return and plumb the other return port to the return side of the passenger tank.
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Old 10-11-2017, 04:26 PM
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Thanks Ed. I ended up buying a vibrant 4an-1/8npt restrictor with a 4AN to 6AN transition until I get around to designing and machining a billet orifice adapter. The diameter of the lines above the fuel filter is what I needed so I can buy the adapter fittings to mate the new RSI hat to the siphon feed and return hard lines.
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Old 10-13-2017, 02:55 PM
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the nylon lines are 5/16 (to jet) and 3/8 (return).
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