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Thread: 2.5 promax fuel rail o-rings
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12-01-2019, 12:41 PM #16
Mr. Tee,
It's never just that easy ... but lets start from the beginning ...
The "pink" and "white" injectors are the same physical size Keihin ( Honda ) injector. The Pink is a "peak and hold" or low impedance and the "white" is a saturated or high impedance like the Deca style "pencil" injectors.
Useless information for O-rings, but I know people who have tried to mix and match the outcome ... not so good
90% of the O-rings .... come from China.
The AC industry went from black to blue and brown when they went to R-134 . However you can get R-134 compatible O-rings in .... black
As well as all color's for injectors .. including black
No matter where you buy from, they need to be Viton ( fluoroelastomer ) to live.
A Keihin stem is 7.5 x 10.25mm or .294" x .404" ( give or take )
A std fuel rail is just shy of 10.5mm or .415"-.420"
Which leaves you two ways to go ...
A 7.5 x 1.5mm https://www.mcmaster.com/9263k568
Or a #11 Merican https://www.mcmaster.com/9464k16
Both of which also come in brown .. https://www.mcmaster.com/o-rings
Which is a touch bigger, they are cheap enough in bulk ... so I keep both. Many aftermarket fuel rails are reamed just shy of 7/16 th's , so the Merican O-ring is a better fit ..
Clear as mud ... ????
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.william1945 thanked for this postDave Strong, tux974 liked this post
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12-01-2019, 12:55 PM #17
I always pre assemble the plenum, clamp it in a vice and run the pump for 15 minutes to check for drips or worse.
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tux974, texasvector liked this post
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12-01-2019, 01:03 PM #18
Capt, I made a hand pump setup and put around 20lbs to check before bolting to block. If they leak they do around 12-15lbs.
Since my stuff sits for some time after building I hate to put fuel to them till ready to run.
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Dave Strong, Capt.Insane-o liked this post
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12-01-2019, 01:15 PM #19
Chaz, your killing me with that much rocket science info......
I give up, to much info for me......
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12-01-2019, 09:48 PM #20
www.InjectorService.com
Call/Text - 204-326-0390
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12-02-2019, 12:36 AM #21
Oohhh, good ta see ya usin fractions by-golly-there-ehh ...
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12-02-2019, 01:10 AM #221980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
RIP Stu
"So many idiots, so few bullets"
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12-02-2019, 08:15 AM #23
Well I had to convert it, I didn't want to confuse the Americans!
www.InjectorService.com
Call/Text - 204-326-0390
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12-02-2019, 11:55 AM #24
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01-29-2023, 12:02 AM #25
5/16 ID x 7/16 OD fit on the brass/aluminum parts of the 3.0L 225hp fuel rail? Do they fit the 225hp 3.0L injector tops too?
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01-29-2023, 10:25 PM #26
I took off the injectors and brass tube o-rings, noticed both were different in size, the fuel injector o-ring was bigger than what is used in the rail angle piece
The inner diameter of each of the fuel rail holes is the same though
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