Blowed&Stroked

I wouldn't suggest replacing parts until you've diagnosed the problem. That's a waste if money really, unless you have the parts laying around?? I'd find the problem, fix it temporarily to get you home, then replace faulty parts. Unless ur wallet is thicker than brains.lol

petrock

+1,000,000,000.....

mebirkle

Still diagnosing... Very sound advice. I just can't make it consistent.

Here's what I do know:

1. It definitely happens when braking only. No acceleration or turning stalls while under gas.
2. It happens after Long highway driving. I can't just go out and reproduce it right now unless I take a two hour drive or similar.
3. It did happen after I got off the highway just stopping at lights going slower and braking for the first time over the weekend.
4. The engine turns over for a spell and then fires (10-15 seconds) instead of two second.
5. No lean conditions after it Starts as in no smoke out the exhaust.

Guess: only seems to happen at 3 quarters or fuller of a tank of gas. I need to verify this.

What I have tried:

1. My gas cap doesn't hiss when I unscrew it. Bought new cap didn't fix and still doesn't hiss.
2. New battery ground connector
3. Sea foam in tank

I think it's either vacuum related (braking vacuum) or no fuel pressure when this happens. I am replacing the switch in the trunk that senses rear crashes and pressure regulator. I am also going to put a fuel pressure gauge to the fuel rail and run it to the windshield to see pressure drop off when it occurs.

Parts in waiting include a newer tank with all internals.

Could one of the tank seals be causing this? I am sure they are stock. Should the gas cap hiss when I take it off to fill up?

Thanks all for te advice. This is surely getting old.

Dave

FrostByte

Sounds to me like you are getting vapor lock in your fuel line. Look for places where fuel line is close to exhaust or any thing else that gets hot & get some space 'tween them.

Blowed&Stroked

My car stalls out sometimes when braking too. But I know why mine does it. It needs a tune and loading up on fuel and killing the motor. I haven't noticed mine doing it in corners tho. But it's another possibility for u to consider

mebirkle

Isn't there something in the tank that also could cause vapor lock? Also, would this occur during braking? Thanks!

Also, I did a tune-up on the car. Anyway to tell why and how it's loading up on fuel??

FrostByte

data log if you have a SCT or other hand held tuner or just take it to a tuner.

http://www.mustangevolution.com/must...an-sct-x-cal3/

Blowed&Stroked

If u check for vapor lock like frostbyte said and can't move lines away from heat source, jegs makes a heat wrap that works very well. I ran a 16g temp sensor wire out a water jacket for thermostat relay for an electric fan on my BB and hasn't melted yet. It melted once all the way thru and I removed the plugin, slid the wrap over, and held it in place with a zip tie. I think it has a 1/2" id so it will fit over a stock gas line.

mebirkle

ProblEm solved. I found a great used fuel tank with very new components. I also had a fuel Line from the tank sitting on the exhaust. I am 99% sure it was a tank component such as the vent valve. The tank was ony $80 so well worth a shot.

Thanks all for your ideas and potential solutions.

Old tank was gross and very rusted.

Dave