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Old May 16, 2024 | 03:43 PM
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They are the same size, this is looking forward
 
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Old May 16, 2024 | 04:37 PM
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Originally Posted by My4Fordtrucks
I have never seen where both lines are the same inside diameter. They are different sizes so you cannot connect them incorrectly.

Idk, I can say that this Bronco has led a interesting life. It was my buddies fathers truck, he bought it brand new back in '89. His father owner an auto body shop and I know the truck was repainted at least once and my buddy has owned it since his dad died in '99. It's on it's 4th engine, 2nd transmission and 5th drivers seat! lol This will be the third fuel tank, so the lines are probably not stock. But at the same time according to the Ford Master Parts Catalog I have, the lines are the same or were in 1990



 
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Old May 16, 2024 | 04:47 PM
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Originally Posted by manicmechanic007

So I if I read this right the lower connection (nipple) is the supply or pressure side from the pump.

Thank you very much!!
 
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Old May 16, 2024 | 05:45 PM
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Right, the bottom ones should be the pressure supply and the top ones the return to the tank
 
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Old May 16, 2024 | 06:03 PM
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Originally Posted by Towmanjbo

They are the same size, this is looking forward

No. They are not. You cannot tell what the inside diameter is from looking at the outside.

EDIT: I went out and disconnected the lines on my ‘87 Bronco. 3/8” and 5/16”



I know for a fact that the lines my ‘89 F-150 with dual tanks is the same way. The pressure and return lines are different sizes.
 

Last edited by My4Fordtrucks; May 16, 2024 at 06:41 PM. Reason: Added picture and text
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Old May 17, 2024 | 04:01 AM
  #21  
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Those are the nipples, you've pushed the lines out of the way
 
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Old May 17, 2024 | 04:18 AM
  #22  
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If you look at the wall thickness (they're the same) you can see that you can tell by the outside of the lines. Don't believe me? Go cut one of your OD 5/16" lines and try shoving in a 3/8" barbed fitting into it.... ask me how I know


 
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Old May 17, 2024 | 04:22 AM
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Here is the 3/8" fitting on a 5/16" line, the same 5/16" line in the previous photos showing the wall thickness.



 
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Old May 17, 2024 | 07:05 AM
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The truck might run out of fuel on hard acceleration with a 5/16 supply line
 
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Old May 17, 2024 | 07:40 PM
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Well apparently it has worked fine on this truck for 20 yrs, that's when the tank was replaced last. I think if I had shown a pic of the other ends of the lines I posted of the reservoir on this truck My4 wouldn't have gotten annoyed. Those lines have no fitting on the other end of the lines so you can see that they are the same size. Despite thinking that they would be because of the different size fittings, it just seems logical. Believe me I thought the same way until the one end snapped off as I dropped the tank. The other line kinked so I cut it off and voila they are the same. Then looking at the parts catalog I see they are the same part number, they must be the same. SMH Just seems wrong
 
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Old May 17, 2024 | 07:53 PM
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Well either way, between your diagram and his pic of his reservoir it has been confirmed that the lower line (with the big fitting) is the feed line. Now this weekend I can replace the fittings on this Bronco and hook to the tank assured I'm doing it correctly and possibly hear it run for the first time in many years! Thank You!!
 
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