Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

 
Reply to this topicStart new topic
> Lower fuel line questions (under tank)
DC_neun_vierzehn
post Jun 9 2024, 07:48 AM
Post #1


Member
**

Group: Members
Posts: 415
Joined: 16-November 20
From: Delaware Shore
Member No.: 24,893
Region Association: MidAtlantic Region



Looking for help regarding correct fuel lines while I await a new Dansk tank to replace the unusable one I received (thread here).

I have a '73 2.0. A PO moved the fuel pump up front and under the tank and cut out a door so that the fuel pump can be accessed from the frunk (like the '75 and '76).

First question: regarding the send and return pipes on the bottom of the tank - the send line measures at 10 mm and the return at 8 mm, yet the list in the AA fuel line kit lists both lines as 7 mm. Is that correct? I didn't want to force it, but I cannot seem to get the 7 mm line in the kit over that 10 mm pipe.

Here are pics of the pipes I'm speaking of as well as pics of what the lines were when I removed the old tank (a 5/16 AKA 7.9 mm USA made line on the send and a 7 x 3 made in Germany line on the return).

Attached Image

Attached Image

Attached Image

Attached Image

Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
DC_neun_vierzehn
post Jun 9 2024, 07:53 AM
Post #2


Member
**

Group: Members
Posts: 415
Joined: 16-November 20
From: Delaware Shore
Member No.: 24,893
Region Association: MidAtlantic Region



Here's the pump location:

Attached Image

Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bdstone914
post Jun 9 2024, 09:45 AM
Post #3


bdstone914
****

Group: Members
Posts: 4,548
Joined: 8-November 03
From: Riverside CA
Member No.: 1,319



Use rubber lines that fit your fittings.
7.5 and 9.5mm.

They have to mate to the lines in the tunnel.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
DC_neun_vierzehn
post Jun 9 2024, 11:32 AM
Post #4


Member
**

Group: Members
Posts: 415
Joined: 16-November 20
From: Delaware Shore
Member No.: 24,893
Region Association: MidAtlantic Region



QUOTE(bdstone914 @ Jun 9 2024, 09:45 AM) *

Use rubber lines that fit your fittings.
7.5 and 9.5mm.

They have to mate to the lines in the tunnel.


Bruce, yes, the return line from the tank will mate with the line in the tunnel. Sounds like you're suggesting a 7.5 mm rubber line there (instead of the 7 x 3 rubber hose that was there originally). Ok.

However, the send line does not mate with the tunnel line - it goes to the square fuel filter (8 mm inlet). Sorry I did not mention that in my original post. Thus, trying to figure out what line to use that goes from the 10mm tank pipe to the 8mm filter inlet.

Attached Image

As stated in original post the original rubber line there was a 5/16" (7.9 mm). I guess was the PO's solution - it appears to have worked since it's in between the two sizes it mates to on each end. Should I just try to find a new 7.9 mm hose?

For what it's worth ... the filter outlet goes to a 12 mm line which connects to the fuel pump. I'm using the square filter that came in Auto Atlanta's kit and a new fuel pump I bought from AA as well. The outlet from the fuel pump mates to the line in the tunnel.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
DC_neun_vierzehn
post Jun 9 2024, 11:35 AM
Post #5


Member
**

Group: Members
Posts: 415
Joined: 16-November 20
From: Delaware Shore
Member No.: 24,893
Region Association: MidAtlantic Region



Were the pipes on the bottom of tanks various sizes depending up on the year?

Trying to figure out why Auto Atlanta's kit has 7mm lines for both pipes (when one pipe is 8mm and the other is 10mm).
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Chris914n6
post Jun 9 2024, 11:47 AM
Post #6


Jackstands are my life.
****

Group: Members
Posts: 3,343
Joined: 14-March 03
From: Las Vegas, NV
Member No.: 431
Region Association: Southwest Region



I've got a 75 with the front mount pump stock. Both tank nipples are 8mm. The pressure side goes to the filter then the pump, so the 3/8" hose fits in between. There is a filter hanger on the firewall (pedal side) across from the pump. In that pic you have the pump facing backwards from stock.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
DC_neun_vierzehn
post Jun 9 2024, 12:12 PM
Post #7


Member
**

Group: Members
Posts: 415
Joined: 16-November 20
From: Delaware Shore
Member No.: 24,893
Region Association: MidAtlantic Region



QUOTE(Chris914n6 @ Jun 9 2024, 11:47 AM) *

I've got a 75 with the front mount pump stock. Both tank nipples are 8mm. The pressure side goes to the filter then the pump, so the 3/8" hose fits in between. There is a filter hanger on the firewall (pedal side) across from the pump. In that pic you have the pump facing backwards from stock.


Interesting. I sounds like the 75 and 76 had 8mm pipes on bottom of tank then. Hence why AA’s kit calls for a 7mm line on both.

The old pump that I removed was positioned the way you mentioned but it seemed fit better this way (less stress on the wiring and lines). I assuming that as long as I have the right lines going into each end of the pump it should not matter). But if I’m overlooking something someone please let me know.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Geezer914
post Jun 9 2024, 03:10 PM
Post #8


Geezer914
***

Group: Members
Posts: 1,470
Joined: 18-March 09
From: Salem, NJ
Member No.: 10,179
Region Association: North East States



Are you running carbs of FI? For FI, Gates barricade 30R 7.9 mm., 50 psi, for ethenol fuel.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bkrantz
post Jun 9 2024, 07:43 PM
Post #9


914 Guru
*****

Group: Members
Posts: 7,831
Joined: 3-August 19
From: SW Colorado
Member No.: 23,343
Region Association: Rocky Mountains



Didn't some original fuel filters have 8 and 10 mm connections?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
DC_neun_vierzehn
post Jun 9 2024, 08:31 PM
Post #10


Member
**

Group: Members
Posts: 415
Joined: 16-November 20
From: Delaware Shore
Member No.: 24,893
Region Association: MidAtlantic Region



QUOTE(Geezer914 @ Jun 9 2024, 03:10 PM) *

Are you running carbs of FI? For FI, Gates barricade 30R 7.9 mm., 50 psi, for ethenol fuel.


Thanks for asking. That’s obviously important. I’m running stock FI.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rjames
post Jun 10 2024, 11:11 AM
Post #11


I'm made of metal
****

Group: Members
Posts: 3,984
Joined: 24-July 05
From: Shoreline, WA
Member No.: 4,467
Region Association: Pacific Northwest



Do early tanks have two different size lines coming off of the tank?

The send/return lines on my '75 tank are the same 8mm (OD).
I would replace the 10mm fitting on your tank with an 8mm one.
What Chris9146 said is how it should be set up. On my fuel filter there is an arrow indicating fuel flow direction. If yours doesn't have that, then it probably doesn't matter which way you connect it.

I would also recommend Gates 3014 T2 fuel line. It's rated for ethanol and 225PSI, so safe for FI. Pricey, but better safe than sorry. I was able to buy it from my local NAPA store.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
DC_neun_vierzehn
post Jun 10 2024, 08:31 PM
Post #12


Member
**

Group: Members
Posts: 415
Joined: 16-November 20
From: Delaware Shore
Member No.: 24,893
Region Association: MidAtlantic Region



QUOTE(rjames @ Jun 10 2024, 11:11 AM) *

Do early tanks have two different size lines coming off of the tank?

The send/return lines on my '75 tank are the same 8mm (OD).
I would replace the 10mm fitting on your tank with an 8mm one.
What Chris9146 said is how it should be set up. On my fuel filter there is an arrow indicating fuel flow direction. If yours doesn't have that, then it probably doesn't matter which way you connect it.

I would also recommend Gates 3014 T2 fuel line. It's rated for ethanol and 225PSI, so safe for FI. Pricey, but better safe than sorry. I was able to buy it from my local NAPA store.


Why - what is the benefit of converting the original 10mm send pipe on my tank to an 8mm other than more hose options?

Because I believe I already have that figured out - use a 9mm hose from the 10mm tank pipe to a Tangerine Racing reducer/adapter (9.5mm to 8mm) then a 7mm hose to the 8mm inlet on the filter.

From what I can tell that should work. Hoses should be .5mm to 1mm smaller than the fitting.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Chris914n6
post Jun 11 2024, 12:39 PM
Post #13


Jackstands are my life.
****

Group: Members
Posts: 3,343
Joined: 14-March 03
From: Las Vegas, NV
Member No.: 431
Region Association: Southwest Region



I used this on a 74 that got a front pump Gates 5/16, 3/8 Inch Hose Connector - 28594. $5 at Oreillys and usually in stock.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rjames
post Jun 11 2024, 12:44 PM
Post #14


I'm made of metal
****

Group: Members
Posts: 3,984
Joined: 24-July 05
From: Shoreline, WA
Member No.: 4,467
Region Association: Pacific Northwest



QUOTE(DC_neun_vierzehn @ Jun 10 2024, 07:31 PM) *

QUOTE(rjames @ Jun 10 2024, 11:11 AM) *

Do early tanks have two different size lines coming off of the tank?

The send/return lines on my '75 tank are the same 8mm (OD).
I would replace the 10mm fitting on your tank with an 8mm one.
What Chris9146 said is how it should be set up. On my fuel filter there is an arrow indicating fuel flow direction. If yours doesn't have that, then it probably doesn't matter which way you connect it.

I would also recommend Gates 3014 T2 fuel line. It's rated for ethanol and 225PSI, so safe for FI. Pricey, but better safe than sorry. I was able to buy it from my local NAPA store.


Why - what is the benefit of converting the original 10mm send pipe on my tank to an 8mm other than more hose options?

Because I believe I already have that figured out - use a 9mm hose from the 10mm tank pipe to a Tangerine Racing reducer/adapter (9.5mm to 8mm) then a 7mm hose to the 8mm inlet on the filter.

From what I can tell that should work. Hoses should be .5mm to 1mm smaller than the fitting.


If you already have an adapter, then yes, no reason to change anything other than to reduce possible failure points. I was trying to address your question 'what line to use that goes from the 10mm tank pipe to the 8mm filter inlet'. You didn't mention you had an adapter until your last post.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
DC_neun_vierzehn
post Jun 18 2024, 07:23 AM
Post #15


Member
**

Group: Members
Posts: 415
Joined: 16-November 20
From: Delaware Shore
Member No.: 24,893
Region Association: MidAtlantic Region



QUOTE(rjames @ Jun 10 2024, 11:11 AM) *

Do early tanks have two different size lines coming off of the tank?

The send/return lines on my '75 tank are the same 8mm (OD).
I would replace the 10mm fitting on your tank with an 8mm one.
What Chris9146 said is how it should be set up. On my fuel filter there is an arrow indicating fuel flow direction. If yours doesn't have that, then it probably doesn't matter which way you connect it.

I would also recommend Gates 3014 T2 fuel line. It's rated for ethanol and 225PSI, so safe for FI. Pricey, but better safe than sorry. I was able to buy it from my local NAPA store.


@rjames thanks for the recommendations. But when I Google "Gates 3014 T2 fuel line" I don't get any matches. Can you share a link where I can buy this online?


User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Superhawk996
post Jun 18 2024, 08:37 AM
Post #16


914 Guru
*****

Group: Members
Posts: 5,965
Joined: 25-August 18
From: Woods of N. Idaho
Member No.: 22,428
Region Association: Galt's Gulch



Google SAE 30R14 T2 which is the spec the hose is made to.

Add Gates to the search if you want to see Gates products
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rjames
post Jun 18 2024, 09:00 AM
Post #17


I'm made of metal
****

Group: Members
Posts: 3,984
Joined: 24-July 05
From: Shoreline, WA
Member No.: 4,467
Region Association: Pacific Northwest



https://www.napaonline.com/en/p/NBHH349A
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Literati914
post Jun 18 2024, 09:13 AM
Post #18


Senior Member
***

Group: Members
Posts: 1,492
Joined: 16-November 06
From: Dallas, TX
Member No.: 7,222
Region Association: Southwest Region



QUOTE(DC_neun_vierzehn @ Jun 9 2024, 08:48 AM) *

.. (like the '75 and '76).

First question: regarding the send and return pipes on the bottom of the tank - the send line measures at 10 mm and the return at 8 mm, yet the list in the AA fuel line kit lists both lines as 7 mm.
..


This is because the 75-76 cars had both pipes as 8mm, and correspond with filter pn133.133.511 (8mm in, 12mm out).

Assuming that's the filter you have - your best bet is to change the big pipe to an 8mm pipe (which maybe should have been included in the kit) ..

(edited^^ after further considerations)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914werke
post Jun 18 2024, 12:17 PM
Post #19


"I got blisters on me fingers"
**********

Group: Members
Posts: 10,185
Joined: 22-March 03
From: USofA
Member No.: 453
Region Association: Pacific Northwest



(IMG:style_emoticons/default/agree.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



- Lo-Fi Version Time is now: 24th June 2024 - 03:05 AM