89 Vett 5.7


Asked by Mar 01, 2016 at 05:36 PM about the 1989 Chevrolet Corvette Coupe

Question type: Maintenance & Repair

If the car sets for 24 hour it will not start on own. If you add gas through the Air
intake it will start up and run fine and start 2-3 hours after but after 24 hours
will not start again unless you add gas to the air intake.
Have replace fuel Pump Filter not sure what to donext?

11 Answers


Does this have the TBI on it?


Not sure what you mean?


Is it Throttle Body Injected, or is there a carburetor on there.


Throttle Body Injected!


This is a fuel issue. I am suspecting the TBI regulator would need to be rebuilt. I would verify the fuel pressure first, should be 9 to 13 lbs. when running, Do you hear the fuel pump prime up with just the key in the on position, and then do you hear it turn off?


Yes you can hear the fuel pump kick in then off. I will check the pressure and see what I find. Thanks for your suggestion.


Ok checked the pressure and from what I found on-line it is right on at 42 lb. when the pump kicks on and not running. I have rebuilt the regulator before the test still no start when setting overnight unless you pour a little gas into system. Has a little bleed off after 10-20 min. Maybe a leaking injector?


Very well could be. do a fuel bleed down test. The fuel gauge hooked in line, cycle the key until highest pressure built up, key off and watch the gauge. Pressure should not drop more that 5 lbs in 3 minutes. Sounds like you have good fuel pressure.


I was wrong on the fuel pressure, but yours is good. It should be 30.5 to 44 lbs. Its just that normally TBI's run at the 9 to 13 lbs, but Corvette is different.


Ya it doesn't drop like that maybe a pound after 10 min.


Everything is good with the fuel then. Don't see a problem, but symptoms point to a fuel issue. So I am thinking possibly the Ignition Control Module. You can take that out and have tested at Auto Zone. When installing these you make sure and put dialectic grease on the underneath side of the module. Wouldn't hurt to have the coil checked also, these components may be weak.

Your Answer

Add photo

Related Questions


Looking for a Used Corvette in your area?

CarGurus has 20,238 nationwide Corvette listings starting at $3,688.


Search Chevrolet Corvette Questions

Chevrolet Corvette Experts

#1 John Carson
John Carson
Reputation 1,940
#2 carGrrl
Reputation 1,310
#3 Tom Demyan
Tom Demyan
Reputation 1,100
View All

Related Models For Sale

Used Chevrolet Camaro"
797 Great Deals out of 38,852 listings starting at $2,650
Used Ford Mustang"
731 Great Deals out of 41,065 listings starting at $900
Used Porsche 911"
148 Great Deals out of 4,434 listings starting at $12,995
Used BMW M3"
86 Great Deals out of 1,918 listings starting at $5,495
Used Mercedes-Benz SL-Class"
108 Great Deals out of 3,662 listings starting at $1,500
Used Ford F-150"
3,268 Great Deals out of 216,650 listings starting at $1,500
Used BMW 3 Series"
1,609 Great Deals out of 39,618 listings starting at $888

Used Cars For Sale

2017 Chevrolet Corvette For Sale
5,619 listings starting at $48,940
2016 Chevrolet Corvette For Sale
49 Great Deals out of 4,028 listings starting at $44,900
2015 Chevrolet Corvette For Sale
45 Great Deals out of 943 listings starting at $41,900
2014 Chevrolet Corvette For Sale
38 Great Deals out of 1,017 listings starting at $37,074
2013 Chevrolet Corvette For Sale
13 Great Deals out of 441 listings starting at $25,500