Hi,

Vehicle sat a long time, and has varnished fuel in the tank I'm assuming. I've diluted it with premium fuel and it runs fine until it gets low on fuel, then I can tell it's getting the trash.

I also suspect I have a pressure issue with the fuel tank because when removing the gas cap it never hisses at me.

Before I drop the rear end and replace the fuel tank with a reproduction one, new pump, sending unit and any lines (to EVAP), are there any other recommendations that might keep me from having to do this?

 

After doing some more reading, it's looking like the best method is to remove the fuel tank. Bah. Was hoping there was a safe way to clean the tank up without dropping it.

 

you could cut a trap door in the top like this to get into the tank to clean it.

 

Two of those lines go up front and two go to the evap canister right?

 

Yeah, i not sure where they go except i know 1 goes to the fuel filter because i just changed it. but i think i'm going to find out sometime soon as i been getting a gas smell from time to time.

 

There's a photo in my profile/albums (Parts/Misc-2) of the sending unit with the lines labeled.

https://www.camaroz28.com/g/picture/8176783


The “Pressure/Vac Relieves Valve” is not part of the EVAP system. It’s the white plastic device hanging in front of the axle assembly, in Shoebox's photo:

http://shbox.com/1/fuel_pump_wiring.jpg

 

Excellent thank you! Those images are what I was looking for.

 

It's definitely trash/varniahed fuel in the tank. When it gets low on fuel it won't run. Sputters and dies, starving for fuel and won't stay running. Pour a few gallons of premium fuel in it, runs like a champ.

I removed and replaced my hood today. I think the next project for when I'm on days off is removing and replacing the fuel tank, pump, sending unit, filter, and inspect all fuel lines.

I think Hawks Motorsports, or Summit Racing has reproduction steel fuel tanks. I'll check and see if they've got.AC Delco pump/sending unit combos as well.

 

When the stock dash gauge is indicating 1/4 tank, the tank can be virtually empty, maybe only a gallon or two left.

The pump is always pulling near the bottom of the tank, through the "sock" filter. The sock filter may be crudded up as well, not getting flow through it, because there is not enough hydraulic head (pressure due to limited height of the fuel) to push the fuel through the filter. Get enough pressure loss through the filter, and the fuel can start to flash (vaporize) in the pump suction, and the pump will be trying to pump vapor instead of liquid.

My car has been sitting for about 5 years with no fuel treatment added. I don't even want to try and start it, because I don't want to create even more problems with the dual pumps, braided SS lines, modified fuel rails, outboard pressure regulator and 74# injectors. And I have about 10 gallons of VP fuels C16 leaded gasoline, in a drum that I need to find a way t dispose of.

 

Injuneer,

My city dump/ landfill has a "hazardous waste" facility attached, which takes things like gasoline, chemicals and paint.
They charge the same for a boatload of that nasty stuff as they do for a standard trailer load of trash.
Give your local landfill a call.
.

 

I'll try that. Our town has tanks to dispose of motor oil, cooking oil, and anti-freeze. I don’t think they take gasoline. But a light bulb did go on.... I retired from a paving/excavating/underground utility company. They have a hazardous waste disposal division, mostly accepting material (including contaminated soil) that can be broken down in the heat of manufacturing asphalt for paving. Maybe they can dispose of it for me.