82 fuel pickup
Thread Starter
Instructor
Joined: Jan 2005
Posts: 172
Likes: 2
From: Cumming GA
82 fuel pickup
First this is a great forum, I have been a member for several months but only posted once way back. The amount of good information and knowledgeable people is almost beond belief.
I would like to know what type of baffles should be in the fuel tank on my 82. I have had it for years now and it has always dropped fuel pressure when the tank is below 3/8ths or so and a hard right turn such as a intersection. The fuel pump and sock has been replaced one time and had no effect. The engine will drop out and then pick back up when it comes out of the turn. More fuel in the tank than that and it never happens.
Any other suggestions would be very much appreciated.
Andy
I would like to know what type of baffles should be in the fuel tank on my 82. I have had it for years now and it has always dropped fuel pressure when the tank is below 3/8ths or so and a hard right turn such as a intersection. The fuel pump and sock has been replaced one time and had no effect. The engine will drop out and then pick back up when it comes out of the turn. More fuel in the tank than that and it never happens.
Any other suggestions would be very much appreciated.
Andy
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
There was a few post here about a week ago that said there was no baffles in the 82.They said the 78 to the 82 was the same tank.I try to find it and get the link.
Here is some info.
http://forums.corvetteforum.com/show...hlight=bladder
Here is some info.
http://forums.corvetteforum.com/show...hlight=bladder
Last edited by ...Roger...; Dec 2, 2006 at 03:12 PM.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
If it were me I would get some of the foam that comes in a racing fuel cell remove the gas cap inlet and stuff it in your tank at both ends-make sure it doesnt interfere with the fuel float for the gauge.
Oh and you can do it from the top of the car-just be very careful not to scratch the paint.
Oh and you can do it from the top of the car-just be very careful not to scratch the paint.
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From: Compound in the Grove, Ga.
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Have you replaced the small black coupling from the pump to the line? ..they are bad to swell and you will lose pressure when the fuel level is below the coupling. While you have the pump out change over to an 85 TPI fuel pump as it has much better volume did mine this summer. Better start-ups and smother idle and throttle response.
Check this link
http://forums.corvetteforum.com/show....php?t=1502169
Check this link
http://forums.corvetteforum.com/show....php?t=1502169
Last edited by FASTAZU; Dec 2, 2006 at 08:06 PM.
Thread Starter
Instructor
Joined: Jan 2005
Posts: 172
Likes: 2
From: Cumming GA
Thanks for the link DWncchs, that answers my question about the baffles. Sounds like I may want to get an eariler tank when the time comes. By the way the pressure drop did come in handy one time when the gas guage stopped working. When the stall happened it meant I had about 1/4 tank left and time to get gas. Thanks again.
Pro
Joined: Nov 2003
Posts: 692
Likes: 1
From: Peabody Ma.
There are no baffles in that tank! I have coverted my 81 to TPI using a stock 82 sending unit, when the tank runs low the fuel sloshs all over! Newer cars the fuel pump sits in a litte can that return line dumps into keeping the pump in fuel all the time. Just keep the tank above 1/2. Also DONT!! replace your pump with one from a 85 they are different 82 crossfire is a low pressure system! 85 is a high pressure system.
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Melting Slicks
Joined: Jul 2005
Posts: 2,740
Likes: 3
From: Aurora Ontario
The best thing you can do is put in an 85 pump. The 82 pump was useless new never mind worn.
The rear TBI regulates the fuel pressure. all the 85 pump does is ensure there is plenty of gas there waiting. Check http://www.crossfire.homeip.net/
I have never heard of an 82 doing what yours is doing. Your problem is something else. Possible the sock at the end of the pump.
Jim
The rear TBI regulates the fuel pressure. all the 85 pump does is ensure there is plenty of gas there waiting. Check http://www.crossfire.homeip.net/
I have never heard of an 82 doing what yours is doing. Your problem is something else. Possible the sock at the end of the pump.
Jim
Race Director
Joined: May 2006
Posts: 16,528
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From: Dayton, Ohio
Here is a link to some foam you can position in your tank that will keep the fuel from sloshing.There are different sizes and prices on the site.This can be done without removing the tank.
http://store.summitracing.com/partde...5&autoview=sku
http://store.summitracing.com/egnsea...s=P%5FRank%7C0
http://store.summitracing.com/partde...5&autoview=sku
http://store.summitracing.com/egnsea...s=P%5FRank%7C0
Pro
Joined: Nov 2003
Posts: 692
Likes: 1
From: Peabody Ma.
I guess you could use the 85 pump, as you are correct about the pressure regulator setting the correct pressure. But thats about 25lbs comming back on the return line. I wonder if return line could handle the extra presure if the reg. failed? I know on my 81 the return line was 1/4 and was not set up to return pressure but It did not come stock with fuel Inj. Just a thuoght?
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
Originally Posted by bruced267
I guess you could use the 85 pump, as you are correct about the pressure regulator setting the correct pressure. But thats about 25lbs comming back on the return line. I wonder if return line could handle the extra presure if the reg. failed? I know on my 81 the return line was 1/4 and was not set up to return pressure but It did not come stock with fuel Inj. Just a thuoght?
Intermediate
Joined: Jan 2004
Posts: 41
Likes: 0
From: Upatoi Ga.
There are no baffels in an 82 tank.I had the same problem(as will all cfi ),the 82 pump doesn't maintain a constant fuel pressure of 9 lbs.,12 lbs. is what I like ,some like more,some like less (9-13). An 85 pump will be the best thing you could do IMHO.Do check out http://www.crossfire.homeip.net/ you will get alot of help with general tuning of the cfi system.Corvette Fourm Rocks
Pro
Joined: Sep 2003
Posts: 511
Likes: 4
From: Phoenix AZ
Originally Posted by DWncchs
Here is a link to some foam you can position in your tank that will keep the fuel from sloshing.There are different sizes and prices on the site.This can be done without removing the tank.
http://store.summitracing.com/partde...5&autoview=sku
http://store.summitracing.com/egnsea...s=P%5FRank%7C0
http://store.summitracing.com/partde...5&autoview=sku
http://store.summitracing.com/egnsea...s=P%5FRank%7C0
Thread Starter
Instructor
Joined: Jan 2005
Posts: 172
Likes: 2
From: Cumming GA
jdp6000, I can certainly pull the pump and sending unit back out and check the sock but when I pulled and replace the pump about a year ago it looked ok as did the new one I put in.
Does anyone know what the clearance between the sock and the bottom of the tank should be? One thought was something had been changed before I bought the car and this is causing the problem.
Corvette forum does rock!!
Does anyone know what the clearance between the sock and the bottom of the tank should be? One thought was something had been changed before I bought the car and this is causing the problem.
Corvette forum does rock!!
Race Director
Joined: May 2006
Posts: 16,528
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From: Dayton, Ohio
Originally Posted by 82Vette'ster
I don't see how you would position or attach the foam in the tank so it wouldn't bump up against the pickup and level. Seems like the foam would move around when cornering when the tank is a little fuller than the foam blocks are tall.
Thread Starter
Instructor
Joined: Jan 2005
Posts: 172
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From: Cumming GA
Thanks DWncchs, that is an option and I will keep it in mind. After a few years with this vette I find I really like the somewhat slower but very curvey roads and turns. The car handles better the lower it is on gas so it is a pain sometimes keeping just enough gas in it to really get into the turns but not drop pressure. There is some great 2 lane but seldom traveled roads in north GA.
Thanks again to all for the suggestions.
Thanks again to all for the suggestions.
Melting Slicks
Joined: Jul 2005
Posts: 2,740
Likes: 3
From: Aurora Ontario
Originally Posted by AT-82Collectors
jdp6000, I can certainly pull the pump and sending unit back out and check the sock but when I pulled and replace the pump about a year ago it looked ok as did the new one I put in.
Does anyone know what the clearance between the sock and the bottom of the tank should be? One thought was something had been changed before I bought the car and this is causing the problem.
Corvette forum does rock!!
Does anyone know what the clearance between the sock and the bottom of the tank should be? One thought was something had been changed before I bought the car and this is causing the problem.
Corvette forum does rock!!
I don't think you can adjust the sock height...it attaches to the pump which attaches to the assemble.
Manual also says there is a plastic liner in the tank...could it have warped???
Jim
Instructor
Joined: Mar 2002
Posts: 144
Likes: 14
From: Central FL
FYI: the '82 fuel tank has a polyurethane liner. The earlier tanks have a rubber liner. The rubber liner tends to separate from the metal tank and cause fuel level/pickup problems. Because it was the last year for the C3 model, GM installed some new, unproven pieces in it to minimize the risk of getting a bad reputation for the new C4 model. Among them was the 700R4 transmission, magnesium valve covers, crossfire injection, and the polyurethane lined fuel tank. 
Thread Starter
Instructor
Joined: Jan 2005
Posts: 172
Likes: 2
From: Cumming GA
jdp6000, as I remember there is a rubber hose about 4 inches long from the steel line to the pump itself. The one that came with the new pump was the same size as the old one but I thought perhaps both might have been a bit short.
The filter gets changed every tune up but the pinched lines is sure something I can check.
I will try some of these suggestions and see what happens. Perhaps this will help someone else with a simular problem.
The filter gets changed every tune up but the pinched lines is sure something I can check.
I will try some of these suggestions and see what happens. Perhaps this will help someone else with a simular problem.