gearhead1986

Iv recently purchased a 1987 chevy camaro Iroc-z28. The car has 58k original miles and had been sitting in a field for quite some time, iv replaced the fuel pump and filter, plugs, wires, cap, rotor, upgraded coil, starter, and just last weekend did the fuel injectors. The car still has this stupid fuel boiling/vapor lock issue and I havent figured it out and im down to 3 options. 1. the muffler is clogged and holding heat thats boiling the fuel in the tank, 2. the fuel lines are way to freakin close to the headers, or 3. the fuel tank isnt ventilating properly. I am useless when it comes to TPI, im old school. The car is a graduation gift for my little brother and i would like for it to be a sound car for him. Is it worth keeping or should i cut my losses and find something else? If it is worth it, what can i do to solve this problem? Please any feedback would be very greatful. Thanks

-Chris

sofakingdom

iTrader: (1)

FI cars NEVER EVER have that, because the fuel is under 40-ish psi of pressure in all the lines; as opposed to SUCTION, like "old school" carbed cars with block-mounted fuel pumps would have.

Define "did". Mental images conjured by that expression aren't pretty.

What's the car REALLY doing?

gearhead1986

ok as simple as i can after 30 mins of driving the car it does not run at all, spits, spudders, after shutting the car off i can hear bubbling coming from the fuel tank. If i wait untill the car cools off it runs fine. I replaced the fuel injectors with factory lucas injectors, not bosch. NOBODY here in south florida can help so this is my last resort

gearhead1986

I forgot to mention the motor, its the TPI 5.0 305. I am a certified mechanic for heavy equipment so i have a very good understanding. Now i know there are some things that differ from a diesel to a gasoline engine but the basics are the same and iv never came across an issue like this.

sofakingdom

iTrader: (1)

Bubbling from the fuel tank is normal.

Since FI cars have 40-odd psi in the fuel lines, no such thing as vapor lock.

Cars since the early 80s have been designed to keep pressure in the tank. If the vent system is not working right, this can get out of hand; some pumps have trouble with this.

Just for the halibut, try leaving the gas cap off; see if it's better. If so, investigate the whole fuel evap system. Vent valve (aka UFO), charcoal canister, purge control, etc. Needless to say, leaving the gas cap off is an unacceptable backwoods hack for a pro mech; but can be a useful troubleshooting tool.

gearhead1986

That's way better then anybody told me, thank you very much. Iv tryed the gas cap ordeal and no luck but i didnt know it went that far in depth with the evap system. Il look into that tomorrow and check back. Thanks again

z28bob

try a flow master muffler with the muffler being under gas tank the stock one gets the gas hot With gas having ethanol now it boils