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[Lordlochwood]

Bought from original owner back in 2013. He had changed EFI(pos Marelli) to carb, but gave me all the EFi parts. Mikuni went belly-up this past winter, so figured I’d retro upgrade to Zipper’s Delphi EFI. Problem is the bungs on the tank…there are two bungs, but are 3/4” fine thread and the OEM fuel hoses for the system are 7/8” course thread.
Question: were there earlier model internal to fuel tank hoses that were 3/4” fine thread, or are there alternatives that will work? The -00 and later hoses are all 7/8” course thread as I went to my local dealer and the parts guys were very willing to help and pulled all the newer numbers but didn’t have any info on earlier models.
I’m afraid the original owner let the shop that made the conversion possibly use a different tank to have them swapped out and made some side money by selling the tank without the owner knowing (naw, dealers don’t do that kind of stuf, right?)

[Alien]

I bought a 2000 Screaming Eagle Rd. glide new in 2000. At one point I converted it to carburetor. I finally converted it to factory Harley Davidson Delphi fuel injection. I’m sorry this is over 10 years ago and I don’t have any information or part numbers to give you. With that being said everything I used was factory Harley Davidson parts. If I remember correctly, the two bungs on my tank were fine thread. When I did mine, they didn’t have any of the block off fittings for the second bung so I had a machinist friend of mine, make one.

So if you’re saying, you have course thread on yours, maybe your tank was changed out at some point? I would look into having a machinist make an adapter?

Good luck


I own that bike for 10 years from mill and Ed close to 100,000 miles on it when it was stolen. One of the best things I ever did for drivability was the Delphi fuel injection.

[Lordlochwood]

Alien,
Thanks for the reply and exactly what I’m looking for in performance improvements.
My tank also has the fine thread bungs, but the parts catalog shows the later coarse thread for the fuel hoses, so maybe the earlier fuel hoses are what I am in need of…
Sorry to hear that someone made off with your ride. I remember the days before LoJack and alarm systems when you chained the bike up in the living room so no one could easily walk away with mine (1978 low rider)
Have thoroughly updated my bike with engine (106” S&S, hi-Flo heads, welded crank, geared cams, 2into2 S&S exhaust), and suspension (front fork inserts, rearend sway link) electronics (all led, upgrade to 2006 radio/cb), hydraulic clutch, etc

[johnsachs]

Perfect recommendation. Mikuni conversion, and all the MM problems WILL be gone. I can't count the amount of them, I've done over the early Twin Cam days.
John

[Lordlochwood]

Guys,
Appreciate all the info, and don’t get me wrong, but I have all the parts BUT the right hoses. Previous owner gave me a box of the marelli Eri, harness, ecm, extra injectors everything BUT the fuel hoses inside the tank. When I go to my hard copy CVO parts catalog, I get course thread hose fittings.
I’m looking for a part number or substitute for just the hoses.
Also, not going with OEM Delphi but Zipper’s marreli replacement kit
If anyone reading this can get me a part number, perfect. If you want to try and talk me out of this, please, save your typing

[Twolanerider]

 please, save your typing

Best of luck on your project .

[Lordlochwood]

Thanks twolanerider! Bike is bitchin and will be that much more for it when I’m done. Unfortunately MoCo is so set on holding the cards close on what does/doesn’t work so they can get you to buy more, and buy Chinese! ‘F’ that…

[Twolanerider]

Thanks twolanerider! Bike is bitchin and will be that much more for it when I’m done. Unfortunately MoCo is so set on holding the cards close on what does/doesn’t work so they can get you to buy more, and buy Chinese! ‘F’ that…

Just spitballing here, so bear with me.  Just climbed back down from the attic where I knew I had two Marelli era tanks stashed away.  One from a 2000 model FLTRSEI and one from a 2002 FLHRSEI.  While that 02 was a first year (for touring) Delphi bike there are several examples of the tanks on them being Marelli with the forward (return) hole plugged.  Both my bike and its spare tank are this way.

On both of these tanks the holes for the check valves are not a fine thread.  I also went through my parts stash.  A baggie that contains 9 different FI check valves (two different diameters) and none are a course thread.  Also three different drag specialties internal line and check valve assemblies for that era, none are a fine thread. 

It's been years since I changed anything over on one of these.  The carb'd petcocks are a finer thread.  All this "typing" so far is to only suggest one thing.  Make sure you don't have a sleeve in an existing hole that is adapting an original hole to smaller diameter and finer thread petcock.  It's at least worth a look.  The image attached is a pretty common (Pingel and others) adapter fitting that screws in to the coarse thread inside the tank for the standard FI fitting and adapts that to the finer thread petcock fitting on the outside of the tank. 

[Lordlochwood]

Hey twolanerider,
Appreciate ya dusting off your stuff in the attic, and hope you didn’t injure yourself like I’d do if I started climbing ladders and moving boxes around in the dark and heat. Appreciate ya doing a sanity check though…
Yeah, first thing I did was check the bung to see if it was a simple adapter… no notches though to spin an adapter out. Scrapped the paint and primer to get down to bare metal and you can see where the original bung was welded in place. The Pringle shutoff valve I took off had a fine thread to fine thread adapter used to install it and the second bung hole was capped also with a fine thread…Wondering now if a just don’t have the original tank on her… bummer!
You said you have a baggie with a few fine thread EFI valves? Or were they all coarse thread? Believe I’m looking for 3/4” fine thread valves so if you do have some would you be willing to let me take them off your hands? Would need to see what they actually look like and whether the quick disconnects work with the OEM high and low pressure lines coming off the m&m body.
Other choice would try to see if you were willing to part with one of those tanks…perfect world would be that one is the metallic blue and silver with that flying chicken on the side…

[Twolanerider]

Hey twolanerider,
Appreciate ya dusting off your stuff in the attic, and hope you didn’t injure yourself like I’d do if I started climbing ladders and moving boxes around in the dark and heat. Appreciate ya doing a sanity check though…
Yeah, first thing I did was check the bung to see if it was a simple adapter… no notches though to spin an adapter out. Scrapped the paint and primer to get down to bare metal and you can see where the original bung was welded in place. The Pringle shutoff valve I took off had a fine thread to fine thread adapter used to install it and the second bung hole was capped also with a fine thread…Wondering now if a just don’t have the original tank on her… bummer!
You said you have a baggie with a few fine thread EFI valves? Or were they all coarse thread? Believe I’m looking for 3/4” fine thread valves so if you do have some would you be willing to let me take them off your hands? Would need to see what they actually look like and whether the quick disconnects work with the OEM high and low pressure lines coming off the m&m body.
Other choice would try to see if you were willing to part with one of those tanks…perfect world would be that one is the metallic blue and silver with that flying chicken on the side…

All the check valves I've got are a coarse thread.  Couple of different diameters but all a coarse thread.  Also checked the part numbers for everything 2000 and up Marelli and early Delphi and all those part numbers are for fittings that are a coarse thread.  Also checked pics from catalog for all the various Drag Specialties parts I knew to look up.  Also all coarse thread.  1999 and earlier Marelli were an entirely different part so that's not your answer either.