Upgrading return line to 3/8"
Race Director
Joined: Apr 2007
Posts: 11,152
Likes: 890
From: South Western Ontario
It sounds like you're on the right path. With the bigger line you know it won't cause an issue with the return flow. You can check the sock condition and how clean the tank is too. I assume that's some kind of bulkhead fitting that will seal to the sender unit plate?
To answer your questions. No, the sending units are nothing alike. The relevance might have been to prove the factory pumps have always just used a sock like I posted way back?
To answer your questions. No, the sending units are nothing alike. The relevance might have been to prove the factory pumps have always just used a sock like I posted way back?
Last edited by lionelhutz; Sep 7, 2018 at 10:01 AM.
Thread Starter
Burning Brakes
Joined: Mar 2016
Posts: 1,008
Likes: 163
It sounds like you're on the right path. With the bigger line you know it won't cause an issue with the return flow. You can check the sock condition and how clean the tank is too. I assume that's some kind of bulkhead fitting that will seal to the sender unit plate?
To answer your questions. No, the sending units are nothing alike. The relevance might have been to prove the factory pumps have always just used a sock like I posted way back?
To answer your questions. No, the sending units are nothing alike. The relevance might have been to prove the factory pumps have always just used a sock like I posted way back?
I couldn't find a bulkhead fitting locally (or a good 90 degree one online that didn't have AN threads), so I'm gonna make something work using a threaded NPT fitting. Thinking I'll either drill a hole, or drill and tap a hole with NPT threads and thread it in, and then put a nut and crush washer on the other side. I'll post pictures for sure.
Melting Slicks
Joined: Jun 2016
Posts: 2,979
Likes: 332
From: Woodinville WA
Ok I took my fuel sending unit out. FYI, on my 79 I was able to remove it without dropping the tank by removing the fuel door and rubber cover, and then finagling the sending unit out of the fuel door hole.
Plan is to remove the 1/4" return line fitting, and use a 3/8" 90 degree fitting with a hose barb on one end (top) and NPT threaded bottom end. Then I can thread on a lenth of 3/8" flared line to put the return...
Plan is to remove the 1/4" return line fitting, and use a 3/8" 90 degree fitting with a hose barb on one end (top) and NPT threaded bottom end. Then I can thread on a lenth of 3/8" flared line to put the return...
Wow! That’s some serious finagling! The sending unit looked the same size as the gas door opening; I did NOT think that was possible.
If you run into any problems hacking up your sending unit and totally screw it up somehow just let me know and you can have my old one for free and try again. (I’m obviously not using it anymore.)
Adam
Thread Starter
Burning Brakes
Joined: Mar 2016
Posts: 1,008
Likes: 163
Wow! That’s some serious finagling! The sending unit looked the same size as the gas door opening; I did NOT think that was possible.
If you run into any problems hacking up your sending unit and totally screw it up somehow just let me know and you can have my old one for free and try again. (I’m obviously not using it anymore.)
Adam
Thanks man! Hopefully won't be an issue, seems like a pretty straightforward job, but I appreciate it!
Race Director
Joined: Apr 2007
Posts: 11,152
Likes: 890
From: South Western Ontario
The sock looks pretty decent to me. The sending unit has a little bit of corrosion, but doesn't look major.
I couldn't find a bulkhead fitting locally (or a good 90 degree one online that didn't have AN threads), so I'm gonna make something work using a threaded NPT fitting. Thinking I'll either drill a hole, or drill and tap a hole with NPT threads and thread it in, and then put a nut and crush washer on the other side. I'll post pictures for sure.
I couldn't find a bulkhead fitting locally (or a good 90 degree one online that didn't have AN threads), so I'm gonna make something work using a threaded NPT fitting. Thinking I'll either drill a hole, or drill and tap a hole with NPT threads and thread it in, and then put a nut and crush washer on the other side. I'll post pictures for sure.
I know what you mean, people love their AN fittings for almost anything custom. A 90* AN-AN bulkhead fitting with a straight hose barb fittings on top?
Where are you finding a nut that fits the NPT thread, or are you making one with a tap?
Last edited by lionelhutz; Sep 7, 2018 at 01:18 PM.
Thread Starter
Burning Brakes
Joined: Mar 2016
Posts: 1,008
Likes: 163
Still kinda brain storming that part, right now I have a 90 degree fitting with a threaded end and a 3/8" hose barb end. I figure I will tap the top of the sending unit for the NPT thread and screw it down, then screw on an adapter that has 3/8 hardline compression on one end and NPT threads on the other to the underside of the sending unit. Liberally JB weld both sides to make sure it is leak-proof and I should be good. Then just attach a section of 3/8 hardline to the compression fitting.
