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Fuel pump vent and return fittings

Tiny
MUGFORS
  • MEMBER
  • 1996 CHEVROLET BLAZER
  • 4.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 216,000 MILES
I am about 85% sure I have them correct, but I just want to be certain, which line on the pump module is the return line, the one next to the pump output line, or the next one over?
Saturday, December 28th, 2019 AT 12:50 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,164 POSTS
Hi,

Here is what I can tell you. The fuel feed line is 3/8" diameter and the fuel return line is 5/16" diameter. Does that help? I can't picture the orientation you described.

Let me know.
Joe
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Saturday, December 28th, 2019 AT 11:28 PM
Tiny
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Actually there are two ports on the fuel pump module that are 5/16”. When looking at the tank from the top, it goes 3/8”, at the top then one 5/16” under that then another under that. There isn’t much play in the lines, so I think I have them hooked up correctly, but I wanted to verify which one of the 5/16” was the return and which one went to the evap canister.
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Sunday, December 29th, 2019 AT 9:54 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,164 POSTS
I attached a pic of the EVAP canister hose. Let me know if it helps. I have no good clear pictures. Sorry about that.

Joe
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Monday, December 30th, 2019 AT 10:47 PM

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