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Blocking off fuel sender return line w/cap #79101
06/24/08 09:38 AM
06/24/08 09:38 AM
Joined: Jan 2003
Posts: 4,084
Indiana
W5Duster436 Offline OP
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W5Duster436  Offline OP
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Indiana
Does anybody know if there are 5/16" caps for sending units?
My car only has a 3/8" fuel line and I purchased a 3/8 sending unit from Mancini and it has a return line fitting on it. I didn't want to stick a piece of hose with a bolt in it etc. and wondered if anyone makes a cap that will withstand fuel?

Re: Blocking off fuel sender return line w/cap [Re: W5Duster436] #79102
06/24/08 10:29 AM
06/24/08 10:29 AM
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Posts: 1,195
Snowing in the north!
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Dart 340 Offline
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I used a vacuum cap on mine. Been working quite well for some time now. No leakage.

Re: Blocking off fuel sender return line w/cap [Re: Dart 340] #79103
06/24/08 11:12 AM
06/24/08 11:12 AM
Joined: Jul 2007
Posts: 1,526
North Carolina
cjskotni Offline
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North Carolina
I agree, A vacuum plug should be fine. That return line shouldn't be continously subjected to liquid fuel to the point it will "eat it" away. Just check it every year or so for deterioration...

Re: Blocking off fuel sender return line w/cap [Re: W5Duster436] #79104
06/24/08 11:19 AM
06/24/08 11:19 AM
Joined: Jan 2003
Posts: 104,346
Garden Grove, CA
OzHemi Offline
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If you have not installed the new one yet, just weld or solder it shut?

Re: Blocking off fuel sender return line w/cap [Re: OzHemi] #79105
06/24/08 11:26 AM
06/24/08 11:26 AM
Joined: Apr 2008
Posts: 1,195
Snowing in the north!
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Dart 340 Offline
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mine reads off so I might do that when I take it out and bend the arm. It is stainless though so it might be a pain. With the old style venting on mine it does not build up any pressure at all in the tank so the vacuum cap has been good to me.

Re: Blocking off fuel sender return line w/cap [Re: Dart 340] #79106
06/24/08 11:53 AM
06/24/08 11:53 AM
Joined: Jan 2003
Posts: 17,838
S.E. Michigan
ZIPPY Offline
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S.E. Michigan
The return line is a really nice feature to have, it keeps the fuel recirculating and cooler + it allows the fuel pump to operate close to peak efficiency...if there aren't any big concerns about originality I'd consider retrofitting a full return system, it'll make a better car


Rich H.

Esse Quam Videri




Re: Blocking off fuel sender return line w/cap [Re: ZIPPY] #79107
06/24/08 12:03 PM
06/24/08 12:03 PM
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Posts: 36,040
Lincoln Nebraska
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RapidRobert Offline
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Lincoln Nebraska
if you don't need a return line for fuel cooling purposes then a 5 cent vac cap works good. I don't know what kind of rubber they are made of but if my gas gauge makes a sudden drop I'll know that it wasn't good enough. No problems yet.


live every 24 hour block of time like it's your last day on earth
Re: Blocking off fuel sender return line w/cap [Re: RapidRobert] #79108
06/24/08 12:49 PM
06/24/08 12:49 PM

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As a guy who's been around the block a few times, using a vacuum cap to plug something as dangerous as gasoline lines is playing with fire, no pun intended.

If you are sure you are never going to use the line, and once again, I'm a BIG believer in vapor return systems, solder the thing shut.

WHATEVER you use, envolving neoprene, CLAMP it. If some hot weather/ vent problem/ fuel slosh event should dislodge your vacuum cap, you could have a problem. Don't endanger your expensive classic for a twenty cent cap.

Re: Blocking off fuel sender return line w/cap #79109
06/24/08 12:53 PM
06/24/08 12:53 PM
Joined: Apr 2008
Posts: 1,195
Snowing in the north!
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Dart 340 Offline
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Quote:

As a guy who's been around the block a few times, using a vacuum cap to plug something as dangerous as gasoline lines is playing with fire, no pun intended.

If you are sure you are never going to use the line, and once again, I'm a BIG believer in vapor return systems, solder the thing shut.

WHATEVER you use, envolving neoprene, CLAMP it. If some hot weather/ vent problem/ fuel slosh event should dislodge your vacuum cap, you could have a problem. Don't endanger your expensive classic for a twenty cent cap.




The cap works fine. Put a hose clamp on it if you want. My car is older so it did not have a canister. If you really want to get cool and creative, splice it into the vent line up high.
The older tanks vented into open air, pressure cannot build up unless something is plugged.

Re: Blocking off fuel sender return line w/cap [Re: Dart 340] #79110
06/24/08 05:11 PM
06/24/08 05:11 PM
Joined: Jan 2003
Posts: 4,084
Indiana
W5Duster436 Offline OP
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W5Duster436  Offline OP
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Posts: 4,084
Indiana
Quote:

Quote:

As a guy who's been around the block a few times, using a vacuum cap to plug something as dangerous as gasoline lines is playing with fire, no pun intended.

If you are sure you are never going to use the line, and once again, I'm a BIG believer in vapor return systems, solder the thing shut.

WHATEVER you use, envolving neoprene, CLAMP it. If some hot weather/ vent problem/ fuel slosh event should dislodge your vacuum cap, you could have a problem. Don't endanger your expensive classic for a twenty cent cap.




The cap works fine. Put a hose clamp on it if you want. My car is older so it did not have a canister. If you really want to get cool and creative, splice it into the vent line up high.
The older tanks vented into open air, pressure cannot build up unless something is plugged.




I put a cap and clamp on. I just didn't want to throw a few gallons of $5 fuel in there to have it leak overnight because it ate through the cap.

Re: hack it with a just a fuel filter? [Re: W5Duster436] #79111
06/24/08 05:41 PM
06/24/08 05:41 PM
Joined: Apr 2007
Posts: 1,261
ILL
mark7171 Offline
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ILL
cant you just use a 2 outlet return style fuel fitler, with a return line?

just complete the system without a charcol cansiter?

the canister only takes the vapor and changes them back to fuel and returns it via the return line. the fitler would just keep it flowing when needed.

Last edited by mark7171; 06/24/08 05:43 PM.
Re: Blocking off fuel sender return line w/cap [Re: W5Duster436] #79112
06/24/08 07:12 PM
06/24/08 07:12 PM
Joined: Jan 2003
Posts: 4,574
Upper Midwest
Black_Sheep Offline
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Upper Midwest
Within a year or so the cheap vacuum cap I bought from the "Help" section dissolved and leaked a huge puddle of 110 in the garage. Fuel hose with a bolt in it cured the problem. Sure it's not pretty, but neither is a burned up car or house...


'69 Plymouth GTX
See you on the street...
Re: Blocking off fuel sender return line w/cap [Re: Black_Sheep] #79113
06/24/08 10:10 PM
06/24/08 10:10 PM

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Quote:

Within a year or so the cheap vacuum cap I bought from the "Help" section dissolved and leaked a huge puddle of 110 in the garage. Fuel hose with a bolt in it cured the problem. Sure it's not pretty, but neither is a burned up car or house...




I'm 60 years old, now. I've seen a few things. I've had at least one of those handy, "neat lookin'" little caps pop off a vacuum port on an early morning startup--you know the ones--when the windows are frosty, it's cold, the hood is "snowed" shut, and you're already late for work.

I sure as hell would not trust one of these on a fuel system.

Re: Blocking off fuel sender return line w/cap #79114
06/25/08 06:11 AM
06/25/08 06:11 AM
Joined: Jan 2003
Posts: 2,521
Richmond Va, KeislerTKO 60...
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VanishPt Offline
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Re: Blocking off fuel sender return line w/cap [Re: VanishPt] #79115
06/25/08 01:12 PM
06/25/08 01:12 PM
Joined: Jan 2003
Posts: 4,084
Indiana
W5Duster436 Offline OP
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W5Duster436  Offline OP
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I will remove it and solder it when I get a chance.


'70 Duster - SDSS 436 W5 4spd (Gone)
'71 Dodge D100
'70 Dodge W100
Re: Blocking off fuel sender return line w/cap [Re: W5Duster436] #79116
06/25/08 01:13 PM
06/25/08 01:13 PM
Joined: Jan 2003
Posts: 104,346
Garden Grove, CA
OzHemi Offline
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Quote:

I will remove it and solder it when I get a chance.




Sounds like a good idea to me

Re: Blocking off fuel sender return line w/cap [Re: OzHemi] #79117
06/25/08 07:03 PM
06/25/08 07:03 PM
Joined: Nov 2006
Posts: 203
Taneytown, MD
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bigslant6fan Offline
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Taneytown, MD
I agree those cheap multi-colored "vacuum caps" are made of vinyl, not even close to being fuel resistant.

Re: Blocking off fuel sender return line w/cap [Re: bigslant6fan] #79118
06/25/08 07:08 PM
06/25/08 07:08 PM
Joined: Aug 2003
Posts: 1,145
ontario calif
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ns1aar Offline
super stock
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ontario calif
Found a golf tee in mine seems to have worked.


NS1AAR
Re: Blocking off fuel sender return line w/cap [Re: ns1aar] #79119
06/25/08 07:10 PM
06/25/08 07:10 PM
Joined: Jan 2003
Posts: 104,346
Garden Grove, CA
OzHemi Offline
Penguin-hating Ginger
OzHemi  Offline
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Joined: Jan 2003
Posts: 104,346
Garden Grove, CA
Quote:

Found a golf tee in mine seems to have worked.




Must be hard to fit under there with the club...



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