Holley Fuel Pump Gas Vapors
 

So I just bought a 1971 camaro and its stinking up my garage and the house. There are gas vapors or gas fumes coming from the Fuel Pump installed behind the gas tank. Its a show car so its using braided hoses. I can't tell if the vapors are coming from the braided hoses or from the fuel pump itself.

In order for the car to run properly you have to turn the fuel pump on 30 seconds before you start it up so the gas gets to the engine. When I am shutting the car off I shut off the fuel pump 30 seconds before I cut the engine to bleed out the lines, but this doesn't help reduce the fuel vapors?

Is this a bad fuel pump, pump not sealed properly or are the braided hoses leaking the fumes?

Oh, and no there is no gas leak as I have run a rag over everything and it comes back clean.

over a period of time the rubber lined braided hoses will weep fuel vapors such as you're experiencing this is due to age of the fuel lines . so just like normal rubber hoses they have to be replaced from time to time . some members here on this site have had good luck with the teflon lined braided hoses and after replacing the old hose with this teflon lined hose the fuel vapors stop

Has nothing to do with the age. PM Ultm8z if you need the specifics since he is the guy that figured it out, but the braided steel rubber lines Don't hold the fuel vapor, new old or in between. Mike and I both switched to Teflon lines and lost the oder. I noticed faster start up because my fuel lines didn't loose the pressure as fast.

I know there is a post about it, I'll see if I can dig up the link.

Multiple threads (all by Mike)

http://www.nastyz28.com/forum/search...archid=1267596

since some states use more ethanol in their gas itll eat up the rubber and itll weep.
luckely in connecticut their isnt much ethanol in our gas.

jgervin, I just PM'd you back...


Basically what's happenining is exactly what Knuckle said. Some portion of the fuel is able to permeate through the rubber. Mine always smelled like "fuel", but not like if you were to put your nose over a puddle of fuel. It was more like a fuel-ish type of smell which I always thought was curious but could never pinpoint.

I'd go up and down the car trying to isolate the source of the smell with my nose but I never found it until, after several years of this (and having given up on trying to solve it), I got hold of a gas analyzer and by probing up and down the fuel lines, I saw huge spikes in hydrocarbon counts anywhere around the lines. That told me the problem was the fuel lines themselves. Once I switched to the teflon lines, bingo... problem solved.

yeah, only 10% :confused:

yea mike im alittle short on cash this week so could yea just roll up your teflon line a fedx it to me :p , thanks a bunch lol;)

minimum of 10% in Virginia..:screwup: