Gas tank fuel line quick disconnect replacements / upgrade - Page 2 - Ducati.ms

FFWD · Jun 22nd, 2011, 7:33 pm

Quote:

Originally Posted by surfguygrif

WHAT YOU NEED TO ORDER.
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2 x LCD10004 - 1/4 NPT Valved CPC Coupling Body (LCD10004) = $21.10
2 x LCD23006 - 3/8 Hose Barb Valved Elbow CPC Coupling Insert (LCD23006) = $21.78
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Be sure the get the valved models so no gas leaks out during your servicing and the barbed hose couplings.

Great info! I've been scratching my head on the CPC site trying to figure out which part numbers to order.

The valved elbows (LCD23006) currently show as "temporarily unavailable", but the non-valved ones (LC23006) are in stock. Does having the valves on both ends completely eliminate fuel leakage during disconnection, or does some still squirt out?

rule62 · Nov 2nd, 2011, 12:02 pm

I had a plastic coupling on my 1998 748 fail last Saturday night. The previous owner had already replaced one of them with a non-valved metal one.

<Incidentally, when the valve on the failed plastic one closed, it caused the in-tank fuel line to pop off of the top of the pump, but that's a different thread. The lines in there were a mess.>

I just ordered a set of valved LCD23006 couplings from, quickcouplings.net, the link in the first post. (I guess they're available now.) When I placed the order, I hadn't read enough about the importance of viton o-rings. I went back to the site. My order had already shipped. I sent a message via the "contact us" link on the website to ask if the viton rings were available. John from quickcouplings emailed me back to let me know he placed two of them in an envelope for me and sent them on their way.

A+ for quickcouplings.net

I can't wait for the parts to arrive so that I can get the 748 back in working order.

rule62 · Nov 9th, 2011, 12:20 am

The couplings arrived today. Fitted them with the viton o-rings. In the meanwhile, I replaced the fuel filter with one from NAPA, replaced the in-tank fuel hose from the pump to the filter and the filter to the base with some Gates 30R10 line (at $25 per foot), and the in-tank vent hoses with some 30R7 (at $1.50 per foot).

I turned the key on a few times to let the fuel pump send gas through the lines, pushed the starter button and the old 748 fired right up.

I hope the 30R7 line holds up okay for the in-tank vent lines.

tsal998 · Jan 10th, 2012, 3:39 pm

great post. this is an upgrade i'll be taking care of this winter since i almost snapped off one of the cheap plastic qd's since i didnt realize they were plastic the first time i took the tank off!

r71 · Jan 20th, 2012, 10:43 am

Thanks for the tip. I just pulled out my 998 out of the storage and fuel started to spray out the side of the tank. I knew right away what it was. I just ordered the last 3 male fittings so if anyone is looking, they are all out.

tsal998 · Feb 25th, 2012, 3:54 pm

does anyone know if this is a straight up swap (metal qd's for the plastic qd's) on the 998? my dealer was just telling me that the 998 is the only model that you CAN'T swap out the plastic male qd's - he stated they are molded directly into the fuel line and told me NOT to cut the fuel line. doesn't make much sense to me, but i haven't taken the tank off yet to look.

also, can anyone tell me which NAPA fuel filter to use? is it the NAPA Gold 3032?

Tony

CptFunnypants · Mar 7th, 2012, 6:39 pm

Is there some sort of sealing washer or thread sealant I'm supposed to use when I put these on the fuel pump base plate? I have the couplings already but just want to make sure before I put them on.

Thanks!

CptFunnypants · Mar 7th, 2012, 9:49 pm

I figured it out. This stuff....

It's resistant to fuel, oil, water, etc. Just put a little bit on the threads and screw it in. Pretty sure after using this it won't come out again, but don't see a reason for it to need to come out again, and it'll be totally sealed.

CptFunnypants · Mar 8th, 2012, 12:43 am

Okay, so I've cleaned the threaded holes as best I can. They look fairly clean, but I can't screw these all the way in. Are they supposed to go all the way in? I'm seeing about 3 threads still showing. This can't be right. Thoughts?

Stick · Mar 8th, 2012, 2:44 pm

If these things really are 0.25" NPT, they should be a bit of a tapered thread--narrower at the tip (of the male thread), and a bit wider as you go up on the thread count. That said, as you thread a NPT male into a NPT female, thing should get progressively tighter. The NPT female should be wider at the opening, and tapered down deeper in the thread bore.

If you go "too tight", you run the risk of cracking the female hole, especially since this (female) one is made of aluminum.

So if you're threading these things in, and all of a sudden the bottom out (before becoming snug), then there's something wrong.

It should be a progressive feeling of "tighter and tighter", as you thread them in.
There's NOTHING WRONG with a few threads showing. Take a look at any black-iron piping in a house (usually found on natural gas installations). Always see some threads showing.

You should be using a fuel-proof thread sealant, made for "pipe threads". Or you can use teflon tape, but the former would be the wisest choice.

I'm finding it a bit difficult to believe that Ducati would use a plastic fitting that was 1/4" NPT. It should be a metric fitting, I would think.

I've never had the pleasure of dealing with the QD's, since the ST2 and ST4s have none of these on the pump/fuel flange.