Air in fuel line?? - Mustang Evolution

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Old 10-21-2012, 05:50 PM   #1
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Air in fuel line??

Is it possible to get air in your fuel line? My car is running really rough after it warms up then I go and start diagnosing problems and came to the fuel rail to purg it and there isn't a steady stream of fuel with the key on or off..... Any suggestions?
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Old 10-21-2012, 06:04 PM   #2
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Look for any kinks or pinches in the lines. Not sure about the air part. Maybe someone has ran into a similar problem though?

---------- Post added at 06:04 PM ---------- Previous post was at 06:02 PM ----------

Fuel filter is also a cheap and easy place to start
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Old 10-21-2012, 07:03 PM   #3
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Look for any kinks or pinches in the lines. Not sure about the air part. Maybe someone has ran into a similar problem though?

---------- Post added at 06:04 PM ---------- Previous post was at 06:02 PM ----------

Fuel filter is also a cheap and easy place to start
Yup I agree with everything you said.
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Old 10-21-2012, 07:37 PM   #4
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I had a pinched line by the tank and it behaved like that.
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Old 10-21-2012, 08:08 PM   #5
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I'll drop the tank tmrw and see what I can find. Thanks....would the fuel pump be a possibility?
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Old 10-21-2012, 08:09 PM   #6
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Not sure, maybe someone else will know that.
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Old 10-21-2012, 08:14 PM   #7
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I would eliminate every possibility I could without dropping the tank. The fuel pump could be a problem, but I've never heard of air in the fuel lines. I would also take a look at the fuel regulator.

---------- Post added at 08:14 PM ---------- Previous post was at 08:13 PM ----------

Quote:
Originally Posted by 91notchback
I would eliminate every possibility I could without dropping the tank. The fuel pump could be a problem, but I've never heard of air in the fuel lines. I would also take a look at the fuel regulator.
I'm just a Stang greenhorn though. My forte used to be....Camaros...
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Old 10-21-2012, 08:56 PM   #8
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I'll drop the tank tmrw and see what I can find. Thanks....would the fuel pump be a possibility?
Possible, if it is aerating the fuel somehow, like a stuck open check valve, broken impeller, etc..


The only other way for the fuel pump to introduce air is if you run it really low on fuel and the baffles are not sufficient to keep fuel at the pump around corners or up and down steep hills. As long as you have plenty of fuel the pump is submerged.
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Old 10-22-2012, 12:27 PM   #9
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Originally Posted by Trojan Horse

Possible, if it is aerating the fuel somehow, like a stuck open check valve, broken impeller, etc..

The only other way for the fuel pump to introduce air is if you run it really low on fuel and the baffles are not sufficient to keep fuel at the pump around corners or up and down steep hills. As long as you have plenty of fuel the pump is submerged.
Another symptom is that is has a loss of power when driving it and it back fires
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Old 10-22-2012, 12:44 PM   #10
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Another symptom is that is has a loss of power when driving it and it back fires
Verify your timing and check the EGR to make sure it's not stuck open.
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Old 10-22-2012, 05:19 PM   #11
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Verify your timing and check the EGR to make sure it's not stuck open.
Still no luck. All it's doing now is starting and dieing. Ran a scanner on it no codes at all. If it sets for a couple hours it will run for a little and then run rough, back fire, then die and not start again. I'm stumped -_-
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Old 10-22-2012, 05:32 PM   #12
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I'm back to fuel pressure/regulator. Did you replace your regulator?
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Old 10-22-2012, 05:37 PM   #13
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sounds like a weak coil or tfi module as long as long as you have adequete fuel pressure.
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Old 10-22-2012, 05:37 PM   #14
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Ah okay there you go.
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Old 10-22-2012, 05:40 PM   #15
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Ah okay there you go.
i could be wrong. but throwing bones here. ignition parts seem to run worse when they get hot. but both parts i mentioned are testable. if the coil is old i would just replace it anyways.
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Old 10-22-2012, 06:28 PM   #16
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i could be wrong. but throwing bones here. ignition parts seem to run worse when they get hot. but both parts i mentioned are testable. if the coil is old i would just replace it anyways.
Coil is only a few months old(msd) tfi not sure of. Gives me a starting point though
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Old 10-22-2012, 06:33 PM   #17
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Coil is only a few months old(msd) tfi not sure of. Gives me a starting point though
There is a test for the tfi in the useful sticky thread.
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