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Old 04-09-2020, 09:12 AM   #1
Mr.Borrie
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Default OEM Fuel line to FPR ?

Busy with some hoses and I am stuck with what adapter I need to get to connect the OEM line to my AFPR

Photo:
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Old 04-09-2020, 09:51 AM   #2
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Might be helpful if you tell / show us with pics what you are working with - I'm assuming LH2.2 if you are talking about the 760 or 780, but what brand fuel pressure reg are you trying to attach?
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Old 04-09-2020, 10:20 AM   #3
Mr.Borrie
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I added photos?

Anyway it’s an lh2.4 connection that goes on the fuel rail OEM
That now goes to a FPR, also in the photo.. sucks they don’t show?



Google photos but the same

Line:




FPR

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Old 04-09-2020, 11:25 AM   #4
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The fitting is metric and has been used on many German cars since the days of CIS.

That fitting is the factory inlet, the factory regulator connected to the other end of the fuel rail.
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Old 04-09-2020, 11:51 AM   #5
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Quote:
Originally Posted by Mr.Borrie View Post
I added photos?

Anyway it’s an lh2.4 connection that goes on the fuel rail OEM
That now goes to a FPR, also in the photo.. sucks they don’t show?
So, depending on what fittings the AEM comes with, there are a few ways to deal with it. If you have moved the FPR to the inner fender and are adding it pre-fuel rail (as opposed to on the rail as factory) then you may want to either:

Cut off the factory female nut/ball fitting & use a quick release fitting instead - they are sold in a variety of sizes. 1/4" I think is what fits the stock hard plastic fuel line.

Cut off the male fitting on the rail (get a spare?) and silver solder / braize that to whatever screws into the AEM FPR. That would be the simplest, assuming you can braise/silver solder.

Look on Summit Racing for ideas - things like Fragola 496206BL Aluminum 45 Degree Female Coupler Swivel Adapter -6 AN and 2) BOOSTEC 5/16" male to -6AN Male Push On/Quick Connect Fuel Adapter Fitting if you want to make some kind of adaptor to convert to the AEM I/O. Problem is, you can end up with a ****-ton of adaptors to get from A-to-B

Hopefully others will have meaningful suggestions for you

Or this type of thing to convert to AN, but then you need large nitrile line





QR fittings:




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Old 04-09-2020, 12:05 PM   #6
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Try these guys:

www.belmetric.com

When I had to repair the fuel pump outlet hose on Cam's 940, they had the OE supplier banjo fitting in stock.
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Old 04-09-2020, 12:26 PM   #7
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Color me stupid but I don't understand how putting the FPR before the rail will maintain pressure in the rail. Won't the pressure just drop off past the FPR since there's nothing to keep the fuel from returning to the tank?
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Old 04-09-2020, 12:31 PM   #8
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Quote:
Originally Posted by VB242 View Post
Color me stupid but I don't understand how putting the FPR before the rail will maintain pressure in the rail. Won't the pressure just drop off past the FPR since there's nothing to keep the fuel from returning to the tank?
No, the AEM FPR has the return. It means you're not using the stock rail return though. Not clear how he was going to handle that.
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Old 04-09-2020, 01:03 PM   #9
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Have you considered a new aluminum rail with AN fittings?
eBay seems to have many cheap options and it would be a lot simpler of an install (assuming it works with the injectors you're running).
https://www.ebay.com/itm/For-Volvo-2...-/301106618709
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Old 04-09-2020, 01:07 PM   #10
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It is definitely easier to use a -6 rail than to adapt an LH 2.4 rail. Probably costs the same once you factory in the adapter fittings you would need to use to make it work.
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Old 04-09-2020, 02:35 PM   #11
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I have the 6An rail on my car however the line from the pump is still OEM, I could go from pump AN too I guess

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Old 04-09-2020, 02:49 PM   #12
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Edit: I think this is what you need: https://www.belmetric.com/hose-conne..._850_923_1328/

A hydraulic hose shop can solder on -6 AN fitting to the feed and return side of the rail for cheap.
Or you can get a Bosch FPR to AN adapter, but they're about $125.

Are you dead heading the fuel rail, or running a return type? That will dictate plumbing needs.
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Old 04-09-2020, 02:54 PM   #13
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Quote:
Originally Posted by culberro View Post
A hydraulic hose shop can solder on -6 AN fitting to the feed and return side of the rail for cheap.
Or you can get a Bosch FPR to AN adapter, but they're about $125.

Are you dead heading the fuel rail, or running a return type? That will dictate plumbing needs.
In that note, I would not recommend a dead head rail if you plan on driving in warm weather with traffic unless you have a way to keep the intake manifold and rail cool enough to keep the gasoline in the rail from boiling.
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Old 04-10-2020, 05:16 AM   #14
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I will only drive this car in summer... is this rail going to be an issue? I am using the fuel return to the tank.. that should solve this issue right?

Pump > AFPR>rail>return line to tank
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Old 04-10-2020, 07:45 AM   #15
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What's going to keep the pressure in the fuel rail? I plan on doing something similar but I will be doing:
Pump> fuel filter>fuel rail>FPR>return line.
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Old 04-10-2020, 09:09 AM   #16
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Pretty sure the AEM is designed for "dead-headed" rail - in other words regulated pressure only.

Look at the pic you supplied and mine. The return comes off the bottom of the FPR - the return is in the FPR body. If you want to use this FPR you need to go Pump-FPR(Return off FPR)-Rail (cap return), or mount the FPR in the factory location as VB242 outlined above
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Old 04-10-2020, 05:43 PM   #17
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Well i'll be looking at redoing some stuff.. Thanks TB for the tips i did not consider this yet

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Old 04-11-2020, 03:23 AM   #18
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Not sure which end of the fuel line you're talking about but classicswede sells these -
https://www.classicswede.co.uk/Fuel_..._19741194.aspx
That bolt into the stock fpr location & allow for a push on pipe or AN6 pipe takeoff.
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Old 04-11-2020, 08:40 AM   #19
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Was just looking for something else in my bookmarks & I came across this -
https://www.jegs.com/i/Earls/361/9894DBH/10002/-1
I'm pretty sure that fits on the fuel rail where you showed in your photo.
I'd bookmarked this from a similar thread some time ago so the details are pretty fuzzy - perhaps someone else can remember?
Tim
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Old 04-11-2020, 03:02 PM   #20
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Quote:
Originally Posted by K9 240 View Post
Was just looking for something else in my bookmarks & I came across this -
https://www.jegs.com/i/Earls/361/9894DBH/10002/-1
I'm pretty sure that fits on the fuel rail where you showed in your photo.
I'd bookmarked this from a similar thread some time ago so the details are pretty fuzzy - perhaps someone else can remember?
Tim
Adapter for re-use of the line would be nice (alixpress sell bunch of them too, I just need to know the sizes)
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Old 04-11-2020, 08:38 PM   #21
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Quote:
Originally Posted by K9 240 View Post
Was just looking for something else in my bookmarks & I came across this -
https://www.jegs.com/i/Earls/361/9894DBH/10002/-1
I'm pretty sure that fits on the fuel rail where you showed in your photo.
I'd bookmarked this from a similar thread some time ago so the details are pretty fuzzy - perhaps someone else can remember?
Tim
The Volvo hard plastic line has a "ball" fitting - and the mating surface in the rail is also spherical - you've not going to find it at Summit, Jegs. etc.

It's possible Bellmetric could have it - you will need to measure the OD of the male thread & get the pitch to determine if someone carries the metric FI fittings used by Volvo & other European manufacturers back in the 80's-90's era
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Old 04-12-2020, 11:41 AM   #22
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Quote:
Originally Posted by culberro View Post
Edit: I think this is what you need: https://www.belmetric.com/hose-conne..._850_923_1328/
Here’s the fitting for the rail that you need. Will require high pressure fuel hose clamps as it’s a barb’d fitting.

With regard to using a female thread and male cone conversion fitting:
I tried the m14 male flare fitting adapter on the rail. While it threads on just fine, it does not seal. The female cone on the rail is a lot deeper (and possible different angle) that the male cone on the conversion fittings.
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