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12-05-04, 06:43 AM
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#1 (permalink)
| | Forum Regular
Join Date: Dec 2004 Location: Mongolia
Posts: 65
| Vacuum in the gas tank
Can anyone tell me if there should be vacuum in the gas tank. When I take of the gas cap there is a whoosh noise as the presure equalizes. I am wondering if this is one reason why I have a hard time with hot starting and also what I should do about it? Is there a vent that could be plugged up?
I have a 3rd world spec FJ 62 no smog stuff, carb, no cat exhaust
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RJ77
120,000km
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12-05-04, 06:48 AM
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#2 (permalink)
| | Forum Lifer
Join Date: Sep 2003 Location: North Florida
Posts: 7,109
| whoosh sound is normal, my rig use to cut off when one of my gas vent lines was loose not letting it create a pressure.
Last edited by lowtideride; 12-05-04 at 08:28 AM.
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12-05-04, 07:42 AM
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#3 (permalink)
| | Parts Geek, M1 Mechanic
Join Date: Mar 2003 Location: Herding cats.
Posts: 15,184
| The fuel tank should be under pressure, not vacuum.
__________________ Original owner 93 FZJ80,locked,blown,water/methanol injected(like a WWII fighter aircraft),lifted,winched,snorkeled,slidered,Sleeed ,moneypit. Balanced on a pin head. 95 FZJ80 trail truck (hers), 94 FZJ80 320K with a knock. 2009 Dodge Challenger SRT8, 425 horse, 6 speed manual trans, cop-attracting-red.  http://i487.photobucket.com/albums/r...Gastrap063.jpg http://i487.photobucket.com/albums/r...frifles004.jpg | |
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12-05-04, 07:54 AM
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#4 (permalink)
| | Utarded
Join Date: Apr 2004 Location: Utah
Posts: 5,363
| Dan's right, the whoosh you hear is actually gas vapor pushing it's way out into the atmosphere. If the tank is under vaccum, there's something seriously wrong.
__________________ Eric, Utah operations commander- Tall Corn Cruisers.
1993 Landcruiser, 197K miles. Lifted, Locked, Slidered, Slee'd, Snork'd, Winched, bobbed. Daily driver. ROTW
1975 Piggy. Awesome edition. LPG/Petrol. | |
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12-05-04, 09:09 PM
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#5 (permalink)
| | 250+ Club
Join Date: Nov 2002 Location: denver
Posts: 597
| Does a positive pressure tank hold true for fuel injection also?
How much pressure should be generated for a fuel system to function properly?
devo | |
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12-06-04, 02:03 AM
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#6 (permalink)
| | Forum Regular
Join Date: Dec 2004 Location: Mongolia
Posts: 65
| Thanks for the info guys. I will check that one off the list
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RJ77
120,000km
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12-06-04, 06:48 AM
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#7 (permalink)
| | Utarded
Join Date: Apr 2004 Location: Utah
Posts: 5,363
| Quote: |
Originally Posted by devo Does a positive pressure tank hold true for fuel injection also?
How much pressure should be generated for a fuel system to function properly?
devo | ANY gas tank should be under positive pressure just by the very nature of gasoline vapor pressure.
Don't know the functioning pressure off the top of my head though....
__________________ Eric, Utah operations commander- Tall Corn Cruisers.
1993 Landcruiser, 197K miles. Lifted, Locked, Slidered, Slee'd, Snork'd, Winched, bobbed. Daily driver. ROTW
1975 Piggy. Awesome edition. LPG/Petrol. | |
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