after filling up car stumbles for a few miles?
09-15-2009, 04:45 PM
#1
TECH Apprentice
Thread Starter
iTrader: (3)
Join Date: Feb 2007
Location: Indianapolis/Louisville
Posts: 378
Likes: 0
Received 2 Likes
on
2 Posts
after filling up car stumbles for a few miles? so after i fill up the tank my car stumbles for about 20 miles, dosnt want to idle and has little power off idle. im not really "topping off", just letting the pump shut off itself. i know an obvious fix is not to fill it up all the way but id like to get this fixed befor it dies in traffic and wont restart one day.
09-15-2009, 05:03 PM
#2
You probably have some water in that batch of gas....OR you have a clogged fuel filter and/or dirty fuel injectors. A clogged/dirty fuel filter will stumble ate low rpm, but will generally be ok after that all the way to WOT, the fuel pressure simply oeverpowers the clog. BUt at idle and low rpm the fuel pressure is low and it'll stumble.
I'd run that tank out, go on the highway for a 2 hour drive. Run it down to "E", then fill it back to halfway and see if its back to normal. Also, put an entire can of Sea Foam into that new half tank of gas and run it through to clean the injectors. If its been awhile since you changed the filter, do it after you run that new half tank out, its very cheap and it takes 3 minutes to change it.
.
I'd run that tank out, go on the highway for a 2 hour drive. Run it down to "E", then fill it back to halfway and see if its back to normal. Also, put an entire can of Sea Foam into that new half tank of gas and run it through to clean the injectors. If its been awhile since you changed the filter, do it after you run that new half tank out, its very cheap and it takes 3 minutes to change it.
.
09-15-2009, 05:57 PM
#3
TECH Apprentice
Thread Starter
iTrader: (3)
Join Date: Feb 2007
Location: Indianapolis/Louisville
Posts: 378
Likes: 0
Received 2 Likes
on
2 Posts
its actually a pretty consistent problem, almost every time i fill up. my air filter could probably use a cleaning or replacement but its defiantly not to that extent. as for the fuel filter and injectors, i doubt it as it only happens the first 20 or so miles after each fill up. im thinking fuel pump but why would it be intermittent after a fill up like that?
09-15-2009, 06:50 PM
#6
Staging Lane
Join Date: Jun 2006
Location: Columbia, PA
Posts: 68
Likes: 0
Received 0 Likes
on
0 Posts
maybe the leak is so small it just takes it awile to build up vaccum and it subsides after the 20 or so miles like you explained. Hell its only a couple bucks anyway, might as well try it.
Trending Topics
09-15-2009, 07:46 PM
#8
I don't think it's the gas cap.
I've driven home from a gas station(20 miles away) more than once with my gas cap loose and the car ran fine, but it did throw a code.
Do you always get gas at the same gas station? If you do try getting it from a different gas station.
The Sea Foam is also a good idea to!
I've driven home from a gas station(20 miles away) more than once with my gas cap loose and the car ran fine, but it did throw a code.
Do you always get gas at the same gas station? If you do try getting it from a different gas station.
The Sea Foam is also a good idea to!
Last edited by 99Bluz28; 09-15-2009 at 07:53 PM.
09-16-2009, 07:43 AM
#10
09-16-2009, 12:24 PM
#12
Moderator
iTrader: (11)
Join Date: Mar 2002
Location: East Central Florida
Posts: 12,604
Likes: 0
Received 6 Likes
on
6 Posts
Immediately after fill your tank pressure is at atmospheric
because the EVAP has not drawn it down. But you'd think
that cold starts would be the same deal with the vacuum
bled out (eventually). But cold starts have so much
enrichment and fast idle, that maybe it's just invisible.
The tank pressure adds / subtracts from regulator and
pump pressure I expect, modifying delivery. So would
fuel level I expect, if the pump is being challenged to
deliver any intake pressure change probably goes
right to the output (regulator should chop it off, but
if your pump puts out less than regulator pressure that
would possibly be a big deal). Hard to say which of
these conjectures, if any, are at play here.
The PCM tries to trim all this out but can't track it
across the fill-up, not right away.
because the EVAP has not drawn it down. But you'd think
that cold starts would be the same deal with the vacuum
bled out (eventually). But cold starts have so much
enrichment and fast idle, that maybe it's just invisible.
The tank pressure adds / subtracts from regulator and
pump pressure I expect, modifying delivery. So would
fuel level I expect, if the pump is being challenged to
deliver any intake pressure change probably goes
right to the output (regulator should chop it off, but
if your pump puts out less than regulator pressure that
would possibly be a big deal). Hard to say which of
these conjectures, if any, are at play here.
The PCM tries to trim all this out but can't track it
across the fill-up, not right away.
