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82 Fuel Pressure issues (1/6)
 9/13/22 3:52pm
tb2k82ceLifetime Member
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Lemon Grove, CA - USA

Vette(s):
1982 C3 Collectors Edition 44000 miles, sat in the sun most of it's life, My wife purchased it for me for fathers day in 2007 from her girl friend that had it for 19 years. It is on the road again. I'm retired but it is now my daily driver.


Joined: 10/17/2007
Posts: 2018

Hi guys I’m back and need some help. I got in my 82 to take it for a ride.  I have not taken it out much for years. I started it every couple of months and others have had it out and about.  That is the history. 

It started ok and I was letting it warm up while I moved the rest of my cars out of the driveway.  Then it started to run poorly and surging then it died. A friend was with me who never gives up the chance to drive it and said he would take it down and get the tank fill up with good fuel.

He started it and took off it was not running great but seemed ok as he drove off.  He called shortly.  He had gotten about two block and it stopped running. I went down there with 5 gallons of new fuel.  Put it in and it would start but ran poorly.  When he put it under load it would stop. Finally got it home.

I Removed all the fuel from the fuel tank.  This remined me when I was a kid and siphoned fuel from other cars so I could go on a date.   I Put in new fuel no change it was night and I choose to wait until the daylight to do any further checking. I’m 77 years old and my days of working on cars are about over with.

I have a fuel pressure gage hardwired between the injectors so I can check the fuel pressure anytime I need too.

I Started the engine still running poorly, I get about 2 pounds pressure while the engine cranks over it starts and jumps up to 3 pounds pressure obviously that is not enough.  If my memory is correct, I adjusted the fuel pressure to around 9 pounds when I put in a 1995 fuel pump about 12 years ago.

Here is my question:

Should the fuel pressure reading when the car is being cranked over be the same or real close to the running fuel pressure?

Could a clogged filter be an issue, or should I just replace both the fuel pump and the filter?

Sorry for the long post I have always been to long winded.



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Re: 82 Fuel Pressure issues (2/6)
 9/13/22 4:59pm
73shark
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.


Joined: 7/9/2003
Posts: 760

IIRC, the '82 has the Crossfire throttle body fuel system. I thought that had an electric fuel pump. If it does then it should have somewhere in the neighborhood of 40 to 50 psi when you turn the key on.  If it is a mechanical pump, then it should have pretty good pressure (7-9 psi) when it's turning over.



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1973 L-82 4 spd

Re: 82 Fuel Pressure issues (3/6)
 9/14/22 1:14am
NorskyLifetime Member
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Twin Lakes, CO - USA

Vette(s):
SOLD - "The Toy" - 1970 Convertible
SOLD - "The Beast" - 1990 ZR-1 (#682)
"BLKBRRD" - 1978 Trans Am, 400ci/225hp, 4 spd, Black w/black interior, Hurst t-tops


Joined: 1/23/2002
Posts: 7014

The '82 does have an electric fuel pump and it is somewhat easily removed through the filler.  Check the sock on the inlet to the pump, that could be clogged up.  Also check the rubber hose from the fuel pump to the fuel line.  Know from experience that it has to be fuel grade rubber or it will turn into swiss cheese.

Don't know what the fuel pressure should be but that info should be in a service manual.

If memory serves there is a fuel filter in the system but I don't recall where it is located.  That should also be in the service manual.

 



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Re: 82 Fuel Pressure issues (4/6)
 9/20/22 12:06am
Adams' AppleLifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


Joined: 11/8/2003
Posts: 19938

Running fuel pressure on the '82 Crossfire is 11psi. The filter is on the passenger side of the frame, right about where the frame kicks upwards at the front(close to the starter area). The fuel pressure should come up to 11psi with the key on for a few seconds. If you don't crank the engine, the pump will shut off. You should still have 11psi while cranking, assuming the battery is hot enough. If the battery is weak, or the starter is drawing too many amps, the fuel pump will slow down, and you'll have lower pressure.






|UPDATED|9/19/2022 10:06:20 PM (AZT)|/UPDATED|


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Joel Adams
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Re: 82 Fuel Pressure issues (5/6)
 9/20/22 3:45pm
tb2k82ceLifetime Member
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Lemon Grove, CA - USA

Vette(s):
1982 C3 Collectors Edition 44000 miles, sat in the sun most of it's life, My wife purchased it for me for fathers day in 2007 from her girl friend that had it for 19 years. It is on the road again. I'm retired but it is now my daily driver.


Joined: 10/17/2007
Posts: 2018

If I'm not mistaken I replaced it about 10 years ago.  It has not gotten a lot of use but if you purchase one through Rock Auto it is not very expensive (less than $20). But if I am not mistaken somewhere along the line they recommended purchasing one from a newer corvette as they were better than the 1982 fuel pressure. 

Does anyone remember what year that was recommended?  I figure if it costs less than $20 I would just as soon replace it again along with the fuel filter.

Thanks for all of you guys helping me in the past and again.

 



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Re: 82 Fuel Pressure issues (6/6)
 9/20/22 8:03pm
Adams' AppleLifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


Joined: 11/8/2003
Posts: 19938

Later year Corvettes will have the TPI or other fuel infection systems that run 45psi and up. Not what you need for the '82....it's too much pressure.



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Joel Adams
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