Update For Ethanol Submersible Hose (Page 2/2)
Patrick AUG 30, 12:22 AM
I'm pretty sure there was was no "flare" or "bead" on my assembly pictured above. With the way the pump is supported from below, IMO there's no way that the connections at either end of the short section of hose are going to blow apart if securely clamped.

[This message has been edited by Patrick (edited 08-30-2022).]

ericjon262 AUG 30, 04:42 AM

quote
Originally posted by Patrick:

I wouldn't be surprised at all if 7.3mm hose is exactly the same size as hose marketed as 5/16 inch. Probably all comes off the same production line. Even if there is a slight difference, I doubt that "stretching" a 7.3mm hose 0.7mm to 8.0mm is anything to be concerned about.




7.3mm= 0.2874 inch

5/16inch= 0.3125 inch

8mm=.315 inch.

7.3 vs 8mm? realistically, it's about .030 difference in diameter, or about .08" difference in circumference. probably not enough to actually be concerned about. 8mm vs 5/16? absolutely doesn't matter for anything on a Fiero.

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fierofool AUG 30, 09:31 AM

quote
Originally posted by Patrick:

I'm pretty sure there was was no "flare" or "bead" on my assembly pictured above. With the way the pump is supported from below, IMO there's no way that the connections at either end of the short section of hose are going to blow apart if securely clamped.




There's no bead on it but it's definitely smaller where the hose attaches. The other sending unit I have still has the hose attached, so I don't know how it's configured. Both are OEM sending units.
theogre AUG 30, 01:11 PM
fuel pump assembly often don't have "locking bumps" on OE pumps, output tube or both. Because there's little or no way to blow off the short hose when clamp(s) get loose.

Example: these "bump" are use on other fuel, oil, and coolant hard lines and outlets.
When you cut out crush coolant pipes under the car then you don't have the bumps and even 2 clamps for each hose end, the hose can easily blow off if you don't do something to support the pipe or lock them someway else.

My F-pump output have about 1/4" gap or less that that the hose spans and no way to blow off the hose.
Many Replacement Fuel Pumps have the bumps because no way to know how plumbing is in all tanks the pump can work and may have more hose to deal with.

Some tank assemblies have "Neck Down section" like just above and others don't. Even if output tube is 3/8" on 87-88 dukes.... GM just use hose to fit 3/8" line and 5/16" pump out. While V6 needs the neck down tube to fit the pulsator...
see https://www.fiero.nl/forum/Forum2/HTML/146240.html
fierofool AUG 30, 01:17 PM
Ah! So, there's the difference. V6's have a pulsator and Dukes don't? Neck down for the V6 and one diameter for the Duke? Otherwise, are the units identical and will interchange?
theogre AUG 30, 03:53 PM

quote
Originally posted by fierofool:
Ah! So, there's the difference. V6's have a pulsator and Dukes don't? Neck down for the V6 and one diameter for the Duke? Otherwise, are the units identical and will interchange?

Is likely several tank plumping "kits" for V6 vs L4 or year by year even before "bigger tank" for 87-88.

V6 might interchange if use on L4 but not other way because of V6 puslator.
But...
84 maybe "84 only" thing or same plumbing as 85-86 duke.
85-86 have different fuel lines to engine for each motor and may have different tank tubes from that reason.
87-88 have similar plumbing to engine w/ both go under the battery so tank tubes maybe closer to same ignoring the neck down for pump.
Before everyone looking in 22P... That "book" have many problems and even when PN are right... May not be exact same as part installed from car factory.

No, Dukes don't use the puslator because of low pressure needed for L4 w/ 9-13PSI.
Replacements for V6 may not need or want a puslator because different pump design and may void a pump warranty if use. So check any doc's w/ replacement pumps. (Nearly all will void the warranty w/o a new pickup "sock." Best if buy both at same time so on same invoice/receipt. even better is same brand for both parts so can't blame X brand for Y failure when dealing w/ warrant issues.)

Remember that Neck down section shown above cost GM whatever amount then multiply X units.... IOW GM use "special" hose to save money on cars, likely not just Fiero, that don't use puslators.