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  #1  
Old 08-06-2009, 12:23 PM
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Replacing Fuel Lines near the tank

I am changing out the soft fuel lines near the tank with biodiesel compatible ones (5/16" SAE 30R9 - viton lined). There are 3 lines back there... 1) Fuel Delivery (attached to fitting that is then screwed into the tank screen), then there are two lines next to each other 2) Return Line and 3) Vent line. What is odd is that the hard lines for #3 seem to require a slightly larger inner diameter (ID) line than the 5/16" I purchased. I am really struggling to push the soft line on and have gotten it slightly deeper then the clamp itself but not as much as it should be.

So my 4 solutions so far are:

1) Don't be a wussy, push that line on harder (I used some silicon spray to achieve what I already did)

2) Don't worry about it, its just a vent line, what you did is adequate.

3) Put the old soft tubing back on as it is just a vent line and the biodiesel (b100) will not really come in contact with this line anyway.

4) Buy some bigger hose.

5) Some other solution/explanation I have not worked out yet.

Thanks
Doug
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  #2  
Old 08-06-2009, 12:35 PM
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Warm the ends carefully with a heat gun - should slip right on.
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  #3  
Old 08-06-2009, 12:45 PM
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I had my indie change mine when he did the intake strainer. There were only 2 lines, but he could not get the 5/16" flexible line on one of the lines. I went and got him a piece of 3/8" fuel line.

I would try to heat the line as suggested above. Heat gun, hair dryer, container of boiling water, etc.

What type of line are you using? If you are using the barrier lined USCG approved line, it may be a struggle even with it heated.
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Old 08-06-2009, 12:51 PM
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The stock fuel lines could be metric like every other part on these cars. I would guess 8mm, which is roughly 5/16" only slightly larger. I'd say 1, 3, 4 are all good options.
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Old 08-06-2009, 12:55 PM
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They are metric and in this case size does matter. I searched pretty extensively for a biodiesel resistant line in 7 and 8mm and couldn't find any. Sometimes I wish we had made the switch to the metric system.
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  #6  
Old 08-06-2009, 02:08 PM
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SAE 30R9 has a viton inner lining. I will see if there is a 3/8 at PepBoys or the like.
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  #7  
Old 08-06-2009, 03:05 PM
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Quote:
Originally Posted by Doug183 View Post
SAE 30R9 has a viton inner lining. I will see if there is a 3/8 at PepBoys or the like.
Autozone sells Goodyear J30R9. It has a blue interior viton lining. They sell it for 2.99/ft. They call it 'injection line' hose at the store. They have 5/16 and 3/8. It was the best price I found for it.

I don't think I messed with the vent line when I did mine. I think I just replaced the supply and return with this hose and had no problems so I can't be of much help for a solution.
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Old 08-06-2009, 04:06 PM
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Fuel Injection Hose SAE 30R9


This looks like good stuff. I am going to bookmark it for when I upgrade to viton.
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  #9  
Old 08-06-2009, 04:45 PM
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3/8 works like a charm. I had the piece I installed just lying around and probably is nitrile (Buena-N) and will swap it out for a SAE 30R9 when I get around to it.

Doug
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  #10  
Old 11-12-2009, 08:48 PM
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How long is that piece?
Is 3/8 ok in that location? no metric id??

Last edited by europower; 11-12-2009 at 09:03 PM.
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