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I have been dailying my 2000 C5 to work for the past couple of months being that the weather is warming up. I notice though that when I get in the car the next morning I have about 1/8-1/4 less in my tank. Recently the car has been having a harder time starting then normal. My first thought was maybe a leaking injector that is literally pouring gas out overnight...or a loose gas cap...or anyting at this point? I was hoping anyone mechanically inclined would be able to share some possible wisdom or atleast places to look.
That's a LOT of fuel being lost overnight! '04s aften have issues with the fuel crossover tubes or even a faulty tank itself. However, I highly doubt that's your issue on a '00. My first question for you would be are you smelling any gas fumes? Are you certain that you're actually losing fuel? It is much more common for people to have issues with the fuel level sensor. If you store the car in a garage, you should be getting an overwhelming gasoline smell if you actually have a leak. If you don't smell anything, it's probably the sensor. If that is the case, you can try running a few bottles of Techron through the car. This will often fix the issue. If you do smell gas, with that kind of fuel loss, it shouldn't be hard to find. Good luck!
Thanks for the detailed response! She unfortunately sleeps outside so cant smell anything at the moment. After doing some additional research it seems you're right about the fuel sending issue or pump being the problem child. I am going to manually measure the mileage for a couple of days and base my decision of what to do on that. Thanks a ton!
That's a LOT of fuel being lost overnight! '04s aften have issues with the fuel crossover tubes or even a faulty tank itself. However, I highly doubt that's your issue on a '00. My first question for you would be are you smelling any gas fumes? Are you certain that you're actually losing fuel? It is much more common for people to have issues with the fuel level sensor. If you store the car in a garage, you should be getting an overwhelming gasoline smell if you actually have a leak. If you don't smell anything, it's probably the sensor. If that is the case, you can try running a few bottles of Techron through the car. This will often fix the issue. If you do smell gas, with that kind of fuel loss, it shouldn't be hard to find. Good luck!
Thanks for the detailed response! She unfortunately sleeps outside so cant smell anything at the moment. After doing some additional research it seems you're right about the fuel sending issue or pump being the problem child. I am going to manually measure the mileage for a couple of days and base my decision of what to do on that. Thanks a ton!
This is from my C6 but same principle. When the contact points on the sending unit become covered, they no longer send the signal when the float switch moves up and down. Bear in mind also that our cars have two fuel tanks. I'd put in a bottle of techron and keep the tank as full as possible so the unit stays submerged. If you have a Chevron station near you, use them exclusively for a while. My C6 did have a vapor canister located on the outside of the tank but I don't know for sure if the C5's do.
Thanks for the detailed response! She unfortunately sleeps outside so cant smell anything at the moment. After doing some additional research it seems you're right about the fuel sending issue or pump being the problem child. I am going to manually measure the mileage for a couple of days and base my decision of what to do on that. Thanks a ton!
Glad to help! Hopefully, a few bottles of Techron will sort out the issue. It's nice when your issues have a relatively cheap and easy fix.
This is from my C6 but same principle. When the contact points on the sending unit become covered, they no longer send the signal when the float switch moves up and down. Bear in mind also that our cars have two fuel tanks. I'd put in a bottle of techron and keep the tank as full as possible so the unit stays submerged. If you have a Chevron station near you, use them exclusively for a while. My C6 did have a vapor canister located on the outside of the tank but I don't know for sure if the C5's do.
no Chevron near me but I trying the Techron a hopefully that helps me out!
This is from my C6 but same principle. When the contact points on the sending unit become covered, they no longer send the signal when the float switch moves up and down. Bear in mind also that our cars have two fuel tanks. I'd put in a bottle of techron and keep the tank as full as possible so the unit stays submerged. If you have a Chevron station near you, use them exclusively for a while. My C6 did have a vapor canister located on the outside of the tank but I don't know for sure if the C5's do.
Techron also fixed most of the fuel sensor issues +1
C5 possible fuel leak?
