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Old 01-08-2018, 06:03 PM   #1
SwedishKnievel
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Default B230FT Fuel Rail Conversion to AN fittings

Has has anyone converted a fuel rail from the stock Volvo fittings to AN? I am thinking about replacing the fuel supply line from the under-car filter (the 2-pump system has been replaced with a single, Walbro in-tank pump) to the fuel rail.

I'd like to add a fuel pressure sender to the fuel rail. I thought it might be easiest to replace the entire fuel line from the filter to the rail with a line that uses AN fittings and then I could add a TEE at the fuel rail for the pressure sender.

I believe there are two ways to accomplish this: 1) cut off the end of the fuel rail and weld on an AN line and 2) source some kind of adapter.

Option 1 is appealing in that it feels 'cleaner'. Option 2) is appealing in that spare fuel rails are only a pick-n-pull away.

Please discuss...
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Old 01-08-2018, 06:06 PM   #2
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Why?
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Old 01-08-2018, 06:11 PM   #3
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To accommodate the fuel pressure sender.

I would like to data-log fuel pressure on this microsquirt converted motor for future troubleshooting purposes.

Two other alternatives would be to weld a fitting to the other end of the fuel rail to accommodate the sender or figuring out a series of fittings to accommodate a TEE for the sender while maintaining the factory fuel line plumbing.

Last edited by SwedishKnievel; 01-08-2018 at 06:21 PM..
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Old 01-08-2018, 06:29 PM   #4
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Why not. But, while you're at it, swap to a billet rail, easier than welding a fidddly little fitting to a stock tube rail...
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Old 01-08-2018, 06:42 PM   #5
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Quote:
Originally Posted by SwedishKnievel View Post
To accommodate the fuel pressure sender.

I would like to data-log fuel pressure on this microsquirt converted motor for future troubleshooting purposes.

Two other alternatives would be to weld a fitting to the other end of the fuel rail to accommodate the sender or figuring out a series of fittings to accommodate a TEE for the sender while maintaining the factory fuel line plumbing.
Factory lines in EFI applications are all shrinked nylon on barbs. A lot of stock rails have shrader valves to measure fuel pressure with. I'd do an compression fittings to the hard line on the front end and use an aftermarket fpr and machined rail if I were you.

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Why not. But, while you're at it, swap to a billet rail, easier than welding a fidddly little fitting to a stock tube rail...
Basically why I asked.
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Old 01-08-2018, 07:21 PM   #6
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Originally Posted by Harlard View Post
I'd do an compression fittings to the hard line on the front end and use an aftermarket fpr and machined rail if I were you.
I did this, the compression AN fittings are hard to find rated for EFI pressures, but Earls has some that are rated to like 200psi. Totally worth it.
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Old 01-08-2018, 08:10 PM   #7
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Just throwing it out there, but Yoshifab offers a fuel rail and then you can just get your AN fittings to suit. Probably best to contact them before purchasing if you're on a tight schedule to make this happen.

https://yoshifab.com/store/red-block...fuel-rail.html

With that, you'd have to get an aftermarket fuel pressure regulator as Harlard stated.
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Old 01-08-2018, 10:29 PM   #8
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https://www.anplumbing.com/adapters/compression.html
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Old 01-08-2018, 10:30 PM   #9
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Quote:
Originally Posted by cwdodson88 View Post
I did this, the compression AN fittings are hard to find rated for EFI pressures, but Earls has some that are rated to like 200psi. Totally worth it.
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Just throwing it out there, but Yoshifab offers a fuel rail and then you can just get your AN fittings to suit. Probably best to contact them before purchasing if you're on a tight schedule to make this happen.

https://yoshifab.com/store/red-block...fuel-rail.html

With that, you'd have to get an aftermarket fuel pressure regulator as Harlard stated.

Yep, -6 to 5/16 or 8mm tube and -10 o-ring to -6 flare. My setup is semi deadhead to minimize the amount of fuel line. Works pretty well.
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Old 01-09-2018, 02:44 AM   #10
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I used just a universal chunk of rail from summit racing, and had a friend drill the injector bungs and tap the ends to adapt -8 orb to AN fittings. Gotta get a bit fancy with the holddowns, but it probably cost less than 100 bucks all said and done. Run out of firewall clearance quick on 240s with big AN stuff tho, banjo bolts start to look appealing!
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Old 01-09-2018, 04:15 AM   #11
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This fuel rail is available on ebay.

https://www.ebay.com/itm/Fit-For-Vol...4383.l4275.c10

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Old 01-09-2018, 07:10 AM   #12
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There is a standard fuel rail with a take off for (I think) the start up injector, instead of the shrader valve. It comes with the hard nylon line to the injector, but the fitting could be replaced.
I bought one to use with a fp sender so I could have the fuel gauge on the dash, but was unable to use it in the end.
There was a thread a while back with the thread sizes etc but it's been a while since I looked into it.
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Old 01-09-2018, 07:30 AM   #13
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Whilst on this topic, I've got a Nathan's fuel rail for the red block, includes both end fittings and mounts. See his old FS thread, if any of the pics still exist. PM with interest, no time to list it yet.
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Old 01-13-2018, 05:58 AM   #14
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Ermeto DIN fitting and nipples size L8 fits directly between Volvo fuel pipe and rail. I use T-fitting when measuring fuel pressure.
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Old 01-22-2018, 01:45 PM   #15
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Quote:
Originally Posted by OttoB View Post
Ermeto DIN fitting and nipples size L8 fits directly between Volvo fuel pipe and rail. I use T-fitting when measuring fuel pressure.
I've spent a fair bit of time looking through this:

http://www.parker.com/parkerimages/e...0fittings).pdf

But I'm clearly not smart enough to figure it out. @OttoB, can you provide some specific direction as to which fitting?

Thanks,

SK
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