Fuel pump going out??? - Forums at Modded Mustangs
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post #1 of 29 Old January 7th, 2011, 01:42 PM Thread Starter
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Fuel pump going out???

02 Saleen Mustang S281-SC, I was getting on the freeway today and starting accelerating. The motor starting hesitating and chugging really bad. At a constant speed it runs fine. When going up hill today or applying more throttle the motor started chugging and hesitating really bad. It hasn't thrown a code yet and all maintanence has been done recently. Is the fuel pump going out? How do you check the fuse and relays? Thanks.
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post #2 of 29 Old January 7th, 2011, 01:50 PM
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have a fuel pressure guage installed? If not this is why I think all fi should have one.

sounds like pump issue, but give her a tune-up with filters and see if it helps

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post #3 of 29 Old January 7th, 2011, 01:52 PM
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you got enough gas in the car?
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post #4 of 29 Old January 7th, 2011, 02:20 PM
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before doing anything with the pump id change the fuel filter first.
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post #5 of 29 Old January 7th, 2011, 04:12 PM Thread Starter
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I replaced the fuel filter about 7 or 8 months ago and haven't had any issues since then. How do you check the fuel relays?
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post #6 of 29 Old January 7th, 2011, 06:18 PM
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If the car starts and runs, the fuse and relay is ok.
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post #7 of 29 Old January 7th, 2011, 09:33 PM Thread Starter
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So how can i find out if the fuel pump is going out?
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post #8 of 29 Old January 7th, 2011, 10:02 PM
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watch your fuel pressure I guess.
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post #9 of 29 Old January 8th, 2011, 02:36 AM
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it might b the fuel pump but that sounds like spark plugs or coil packs goin out. give it a tune up n make sure ur gettin spark


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post #10 of 29 Old January 8th, 2011, 02:41 AM
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You need to check your fuel pressure. Either by using a scantool that lets you view live date, or datalog it.

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post #11 of 29 Old January 8th, 2011, 09:40 AM
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when my fuel pump died like 8 years ago, it acted up randomly, shutting down for few seconds to making my car stall completely and had to stop on the sides of highways (sigh) but i'm telling you, before it actually died, sometimes i would have no symptoms for many days in a row...
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post #12 of 29 Old January 8th, 2011, 09:48 AM
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Clean your throttle body bore, and egr. Make sure your air filter is good. Check the plugs also.

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post #13 of 29 Old January 8th, 2011, 02:18 PM
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What should the fuel pressure be ?

Last edited by Nicos2001GT; January 9th, 2011 at 07:23 PM.
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post #14 of 29 Old January 8th, 2011, 03:00 PM
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how does one check the coil packs, because my car does exactly what he describes but just after accelerating hard
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post #15 of 29 Old January 8th, 2011, 09:34 PM
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^ Just take a 10MM socket and ratchet, and undo the bolt that holds on and pull it out.

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post #16 of 29 Old January 8th, 2011, 09:47 PM
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Quote:
Originally Posted by Gauge View Post
^ Just take a 10MM socket and ratchet, and undo the bolt that holds on and pull it out.

actually, it is a 7mm socket

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post #17 of 29 Old January 8th, 2011, 10:30 PM
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+1 on coils

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post #18 of 29 Old January 8th, 2011, 11:51 PM
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so... how do you know if its going out then lol
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post #19 of 29 Old January 9th, 2011, 07:23 PM
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Originally Posted by Nicos2001GT View Post
What should the fuel pressure be ?
Anyone?
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post #20 of 29 Old January 9th, 2011, 07:32 PM
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to be accurate you will also need a vac/boost guage. pressure maintained at injector tip is 39psi. so at 20" vacuum (normal idle without aftermarket cams)it will be ~ 30 psi(every 2" of vac = 1 psi so 39-10= 29) and at 10 psi boost it will be ~50psi(39 +10 = 49)

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