filled tank last week, drove over 100 miles

still reading full....any ideas whats wrong

thank for your help(1990 6sp. 108000 miles)

 

Fuel tank sending unit's likely broken. I'd pull the unit from the tank and inspect. It's easy to get to.

You'll first need to disconnect the negative battery cable and relieve the pressure in the fuel system.

To relieve the fuel system pressure, simply remove the gas cap and let the car sit for 15 minutes. Once the pressure is relieved, drain your Corvette’s fuel tank and remove the tank filler door attaching screws and bezel.

Next, lift the fuel tank filler pipe housing and disconnect the drain hose from the nipple. Before disconnecting the fuel tank filler pipe housing, clean all fuel connections and surrounding areas to avoid contaminating the fuel system.

Next, disconnect the fuel hoses and EVAP hose from the fuel sender assembly. Plug or pinch the fuel feed and return hoses and remove the fuel sender electrical connector. To finish removal of your fuel pump and sending unit. remove the fuel sender assembly attaching screws, assembly, and gasket.

You can re-install the old gasket, but first check to see if your new sending unit came with a new gasket. If it did, then discard the gasket and thoroughly clean the gasket sealing surfaces.

If you just purchased a new fuel pump, you'll need to purchase a gasket separately or re-install the old gasket. Finally, cuts, nicks, swelling, or distortions are common on the fuel feed, fuel return, and EVAP hoses, so be sure to inspect these hoses before proceeding.

Once you're ready to install your new fuel pump and sending unit, begin by positioning the gasket on the fuel tank with the notch facing forward in the right hand corner of the tank.

Carefully fold the strainer to allow it to fit through the opening in the tank. Next, install the fuel sender assembly into the fuel tank, and re-connect the fuel sender electrical connector.

Then, connect the EVAP hose and tighten the hose clamps. Re-connect the fuel drain hose to the nipple on the filler pipe housing and place the housing around the filler pipe.

Now you can re-install the filler door bezel, add fuel, and re-connect the negative battery cable.

Before driving your Corvette away, be sure to turn the ignition switch on, off, then back on, checking for any possible fuel leaks. If no leaks are present, your fuel pump replacement was a success!

 

thanks i will try to get to it this weekend.

would that also make it feel a little rough

it just feels a bit off

 

Not the sender itself, but a failing (or partially clogged) fuel pump can certainly cause sputtering, hesitation, hard starts, etc...

 

If you haven't changed the fuel filter do it while you have the pump/sender unit out of the tank - a whole lot less mess that way.

 

filter was changed 3 mo. ago

running good until i put gas in it at a different gas station

 

would bad pump make the gauge not work

 

A bad sending unit could make the fuel gauge not work. It could also be hung up from rust. Bad gas (excess sulfur) can also cause the sending unit in the tank to fail.

Holiday Weekend Debacle Will Cost Shell

Just before the holiday weekend, Shell Oil had to stop selling gasoline at more than 500 stations in Florida and Louisiana due to unusually high levels of sulfur that could cause fuel gauges to stop working.

The bad fuel was sold throughout Florida in stations branded as either Shell or Texaco, and also in the New Orleans area. About 40 Chevron stations in the New Orleans area were also affected.

The problem fuel, supplied from a refinery in Norco, Louisiana, contained unusually high sulfur levels-high enough to foul the delicate silver circuits of fuel-level switches, either rendering them temporarily inoperable or completely ruining them.

Shell said that the sulfur levels should not cause any engine damage. High sulfur levels are also known to affect some emissions equipment, though Shell did not release any information about the possibility of damage from such short-term use.

Prior to the news breaking on Friday, Shell had already received 825 claims of fuel gauge problems likely due to the bad fuel and many more inquiries.

The gauge issues could prove a significant financial liability for Shell, as gas gauge issues normally cost several hundred dollars to fix-much higher for some vehicles. Station owners also will have deal with the loss of income from one of the year's biggest driving weekends.

Despite the supply issues for Shell, there did not seem to be any shortage and gasoline was still selling at low prices in the region compared to the rest of the country.

The average for the New Orleans area on Friday was $1.94 per gallon. By the end of the weekend, Shell had managed to bring gasoline service back to most of the stations in the affected regions. Premium fuel was reportedly unaffected by the problem, and was being offered for the price of low-grade in some locations so they could do business.

Customers who believe they have a problem with their vehicles due to the bad fuel should call Shell at 866-562-6690 or 877-825-2467, or Chevron at 800-362-8900.

 

The filter that was replaced was probably the one up front on the passenger's side. The other member was referring to the fuel sock on the outside of the pump inlet.

 

The other member was referring to the fuel sock on the outside of the pump inlet.

I'd swap that one out, too. Although if you buy a new assembly, I would imagine the sock would be included, too.

 

Probably not. I would think the sock might be included with a new fuel pump but not a fuel level sending unit.

 

i was just told over $400 for sending unit

if i get a new pump and sock and clean up the float with a little wd-40 do you think that could be all i need

pump and sock $80

 

i also changed my plans and i am in the middle of taking it apart

 

just got it out

float moves freely,,no real rust problems on the inside

what else should i look for

 

There are procedures posted on the forum to clean the sending unit. I just did it last week, it was really easy and worked like a charm. Check this out, it should help: http://forums.corvetteforum.com/c4-t...h-article.html

 

Use an ohm meter and measure the resistance as you move the arm through its travels. IIRC it should be from 0 to 90 ohms.

 

thanks i got the advice on how to clean and test it after i had it back in

i'm going away this weekend , i will pull it back out next week and sand it and test it

on the other hand i put in a new fuel pump and sock since it was out and holy s**t what a kick in the head.i think the old one was on it's way out

i'll let you know how the sending unit works out

 

At least you know you'll be good-to-go when all's buttoned down again.