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Old 11-28-2010, 05:09 PM   #1
dahlinc
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Default What are signs of fuel pump going out?

today while i was driving on the free way today and my car has a full take of gas and it cut out for a half a second like it was running out of gas. It did it twice on the way home and it was about a 25mile drive.

Any ideas on what it could be?
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Old 11-28-2010, 05:15 PM   #2
axleon2
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Dirty fuel filter, fuel injector(s) and last the fuel pump. But it could possibly be bad gas too. I would try checking the things I listed in that order.
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Old 11-28-2010, 05:53 PM   #3
azn2nr
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fuel pressure regulator is a good thing to check too. i would try a plug in fuel pressure gauge in the supply line to check static pressure, if pressure is low pinch off the return line. if it goes up then its the regulartor and not the pump.
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Old 11-28-2010, 06:13 PM   #4
dahlinc
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where could i get that checked at?
Subaru dealer?
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Old 11-28-2010, 06:30 PM   #5
homemade
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they usually just die all at once. dont they.


thats been my experience. they just stop working. and then you take it out and smack it on the ground and it starts working again.

thats how i did my corolla and the fuel pump worked for another 5 years. hahaha.
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Old 11-28-2010, 06:48 PM   #6
08WhiteRex
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It sounds like the pump or the injectors. Everything else mentioned would not act sporadically like you're describing. I say fuel pump.
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Old 11-28-2010, 06:53 PM   #7
dahlinc
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should i run some fuel cleaner through my system to see if that helps? its only happened to me this one time
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Old 11-28-2010, 06:58 PM   #8
bhhamblin
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Might as well try. Get the BG brand fuel cleaner stuff tho.
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Old 11-28-2010, 07:03 PM   #9
dahlinc
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ok will do tomorrow
thanks for the info everyone this gives me a idea of where to start
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Old 11-28-2010, 07:55 PM   #10
homemade
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or what about seafoam.


also if it keeps it up and you notice a routine like only after 15 minutes of driving and maybe it gets worse
then you may want to check the throttle position sensor. those can go bad and act like that too. all of a sudden
it feels like you let off the gas even though you didnt.
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Old 11-28-2010, 07:56 PM   #11
907Bum
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I've seen a fuel pump die slowly, my car ended up shuttering and almost dying a couple of times (over a couple of days), bogging down on normal cruise and then eventually after it did that whole process a couple of times over a week or so it just died.
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Old 11-28-2010, 08:12 PM   #12
dahlinc
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Quote:
Originally Posted by homemade View Post
or what about seafoam.


also if it keeps it up and you notice a routine like only after 15 minutes of driving and maybe it gets worse
then you may want to check the throttle position sensor. those can go bad and act like that too. all of a sudden
it feels like you let off the gas even though you didnt.
ill check that to because thats pretty much what it felt like, i let my foot off the gas even though i didnt but ill look at a few things tomorrow
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Old 11-29-2010, 03:19 PM   #13
godfather2112
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From my experience the pump just shuts of. I dont think they slowly go out.
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Old 11-29-2010, 05:48 PM   #14
homemade
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Quote:
Originally Posted by godfather2112 View Post
From my experience the pump just shuts of. I dont think they slowly go out.

this is my experience too. it just goes out. on or off. workie or no workie.
but if it did go out over a weeks time its still pretty rapid. not like over a period of weeks where you never really know if youre going to make it to work or not. your car will be stranded at home within the week. and then you know you have something to fix for sure.

my old 2.2 did this same thing to me. it would feel like i let my foot off the gas, rpm drop to like 1k then i'd have to take it out of gear and back in and that would fix it. after a while i had to shut the car off and back on to fix it. all on the freeway. haha.
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Old 11-29-2010, 06:34 PM   #15
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The best way to properly diagnose a car, is in person. Give me a call and I would be more than happy to take a look at what may be causing the hesitation you described. There are a few quick tests we can run to narrow it down a bit.

Tony-801-856-4908
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Old 11-29-2010, 06:48 PM   #16
08WhiteRex
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Sometimes what happens is the internal seals go bad. The pump loses pressure and the car will studder until it builds more pressure. Even a loose connector would cause it to cut out. I find it incredibly odd that a filter or clogged injector would periodically completely clog and then clear itself. It's more symptomatic for it to completely lose pressure and not come back, or to slowly lose fuel pressure and not regain it.
And yes the throttle position sensor also fits, so i would check that as well.
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