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Old 02-22-2020, 01:51 PM   #14
hatzie
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Join Date: Oct 2008
Location: Wentworth, NH
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Re: planning out dual tank fuel system for LS swap

Quote:
Originally Posted by Mattchu60 View Post
Yes- the EP 381 will fit right into the stock sending unit. Its physically the same as the stock TBI pump.

One thing I did - may be overkill - but I also got a 1 ft piece of submersible EFI fuel hose. I believe its actually 5/16 and not 3/8 in the tank as well. Common issue is that the stock hose they send you will slowly degrade and eventually burst, causing you to lose all fuel pressure.
Not overkill at all. If it's inside the tank use SAE J30R10 hose. Anything else will fail much sooner than the correct hose.
Don't buy any more than a foot or so. You shouldn't use it anywhere outside the fuel tank. The outer jacket doesn't have Ozone and thermal resistance characteristics for exterior use.

Use SAE J30R9 hose for fuel injection runs outside the tank with German Fuel Injection clamps or Oetiker ear clamps. The downside to the Oetiker clamps is they are one use and throw away. SAE J30R9 hose is 100psi max working and 900psi burst IIRC. Whatever you do don't use worm clamps on hoses smaller than @ 5/8" ID.

This is my hoses and clamps writeup where I attempted to list most of the common SAE hose types and what they are used for along with some of the more common hose clamps.
http://67-72chevytrucks.com/vboard/s...d.php?t=696742
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2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
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And please let us know if and how your repairs were successful.

Last edited by hatzie; 02-22-2020 at 01:59 PM.
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