I have been told that the vent valve for the gas tank is defective. Fuel does not go in at normal rate. The fuel filler hose was replaced a few months ago and still having the problem. Now, they must drop the tank again to replace the vent valve. No trouble codes stored and no indication, check engine. What do you think?

 

I think I would go someplace else for service. Here is the GM Shop Manual procedure, you do NOT have to drop the tank !

Document ID# 425745
1999 Chevrolet/Geo Corvette


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Fuel Tank Vent Valve Replacement
Removal Procedure




Loosen the fuel filler cap.
Remove the right rear wheelhouse panel. Refer to Wheelhouse Panel Replacement in Body Rear End.
Disconnect the fuel tank vent valve pipe quick-connect fitting (3).
Disconnect the fuel tank vent valve pipe from the rear wheelhouse brace strap (4).
Remove the fuel tank vent valve (1) from the rear compartment brace (5).
Installation Procedure




Install the fuel tank vent valve (1) to the rear compartment brace (5).
Connect the fuel tank vent valve pipe quick-connect fitting (3).
Connect the fuel tank vent valve pipe to the rear wheelhouse brace (2) with a tie strap (4).
Install the right rear wheelhouse panel. Refer to Wheelhouse Panel Replacement in Body Rear End.
Tighten the fuel filler cap.

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Document ID# 425745
1999 Chevrolet/Geo Corvette

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I also hope they did this one right, for it is for your problem:

Document ID# 1501178
1999 Chevrolet/Geo Corvette


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Vehicle is Difficult to Fill with Fuel or Filling Station Pump Shuts Off Before Tank is Full (Replace Tank Filler Hose) #04-06-04-031 - (Apr 22, 2004)
Vehicle is Difficult to Fill with Fuel or Filling Station Pump Shuts Off Before Tank is Full (Replace Fuel Tank Filler Hose)
1997-2004 Chevrolet Corvette

Condition
Some customers may comment that their vehicle is difficult to fill with fuel or when filling, the pump continuously shuts off before the tank is full.

Cause
This condition may be caused by back pressure within the fuel filler hose. This back pressure trips the fuel nozzle prior to filling the tank, or results in a hard to fill condition.

Correction
Replace the fuel tank filler hose with P/N 10353139. This new hose has been redesigned to provide smoother flow conditions within the section. Use the procedure listed below.

Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in the General Information sub-section of the Service Manual.
Remove the left rear tire and wheel.
Remove the left rear wheelhouse panel.
Loosen the lower hose clamp through access hole in body using ¼ drive ratchet and extension.
Loosen the upper hose clamp.
Remove the fuel tank filler hose.
Install the new fuel tank filler hose.
Tighten the upper hose clamp. Tighten
Tighten the fuel filler hose clamp to 4N·m(35 lb in).

Tighten the lower hose clamp through access hole in body using ¼ drive ratchet and extension. Tighten
Tighten the fuel filler hose clamp to 4N·m(35 lb in).

Install the left rear wheelhouse panel.
Install the left rear tire and wheel.
Lower the vehicle.
Parts Information
Part Number
Description

10353139
Hose, Fuel Filler


Parts are currently available from GMSPO.

Warranty Information
For vehicles repaired under warranty, use:

Labor Operation
Description
Labor Time

L1065
Neck, Hose and/or Vent Hose, Fuel Tank Filler -- Left Tank -- Replace
0.5 hr*


*This time is updated from the current Labor Time Guide. The next update of the Labor Time Guide will contain this change.



GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
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Was a solution ever found?

 

I would certainly hope so since this thread is 13 years old. Looks like the OP was getting ripped off. No tank drop is required to replace either the vent valve or filler hose.

 

Closed and moved to C5 Tech.