hi all,

My car suddenly topped whilst driving.
The fuel pump fuse and the relay were burned. I installed a new relay and fuse (the relay may have been burned from way before, i dont know)
Whenever i start the car, it runs but stops because the fuse burns.
I have tried, 10,25,30 amp fuses and all have the same result.
I took out the fuel pump, connected it directly to the battery and it works properly.
Btw im using a carb instead of injection
Im getting a headache because of this
Anyone any ideas?

thanks

 

Multimeter w/ long leads and start buzzing the wiring out.

 

First things First, Welcome to the Corvette Forum, AndyGinis!

You need to be very careful doing what you did. I would replace a blown fuse with the same size but Never with a Larger Rated Fuse. That is the fastest was to have a wiring meltdown or even a fire. I have heard horror stories and seen the results of Corvettes that catch on fire due to electrical causes. They frequently happen in in-accessible areas under the hood or dashboard and the results are not pretty.

Your Fuel pump circuit clearly has a problem. Like so kindly mentioned in the earlier reply get out a Multi-meter and go to town. I would assume you have a different fuel pump than what we use in the Stock Fuel Injected L98 engines. For a Carburetor you need 6 psi, the C4 fuel pump makes ~ 43 PSI or even 58 psi as on my other Fuel Injected Corvette. You have a fuel pump, is it being driven by the Corvette's Relay system or did somebody create their own? The fuel pump is a good starting place. In home-built Carb retrofits we have seen a lot of ways of wiring in the fuel pump.

With your Ignition and key in the "Run" position measure the battery voltage present at the Fuel Pump power connections. What is the Voltage?
I would also measure the voltage at the Battery and then at the Fuse panel where the Fuel Pump gets it power, these should be very close to the same.
You are going to need a multi-meter to find this problem. Start looking for a ground or something that is drawing a lot more current than normal.
Let us know how this fuel pump is wired, factory wiring or home-made?

The more we know the better we can help you on this great site. I would strongly suggest you take a few moments and fill out the "Profile Section" with all pertinent information about your Corvette. How long you have had it? Mileage? When it was converted to a carburetor and anything that might help us on this end. It helps us on this end as we don't have to repeat questions while we are trying to help you.


Gather as many Voltage readings and we can move on once we know more about your Corvette.

 

What kind of fuel regulator are you using? Deadhead or return style?