Fuel pump hesitation after driving long distances on highway.

stang8urimport · Mar 24, 2008

Well, it happened with me today. We just got back from Kansas City after going to Harrah's and blowing way too much money. Coming down from interstate speed (80ish) to a rest area... second gear... give it a little gas and it stumbled pretty bad. I know there is a TSB for this problem... But I will just fix it myself if it actually causes a problem. So that's my question. Does this mean the pump is going bad, or that it just might do this every so often...? As in, it's not going to fail eventually due to this problem.

Nick

COBESGT · Mar 24, 2008

Bad Fuel Pump

My Brother and I were taking a trip from Iowa to Tennessee in his 89 GT and we kept having these stalling problems when were on the interstate. The car would die and we would coast to the shoulder. Let it sit for a couple of minutes and the car would start right back up. This happened about 4 or 5 times on the way down. It seemed like it was ignition related, so when we got to our destination we replaced the coil, battery, and the ignition module. Anyway, we didn't have any problems with the car for two days and then on our return trip home the car acted up again, same as before. Then I suspected the fuel pump, so we always tried to keep the tank about 1/2 full. This seemed to help and we made it home and my brother got the fuel pump replaced and never had any other problems like that again.

So, to make a long story short, your fuel pump is probably going bad.

stang8urimport · Mar 24, 2008

COMPLETELY different problem with the S197. If my car died a couple times then after a cool down started back up... I would have already replaced the fuel pump. This is a minor hesitation problem common on these cars.

I know others have had this problem... Where ya'll at?

anthony05gt · Mar 24, 2008

I read about this quite a while ago. There is a tsb on the problem and I think it's due to the fuel pump drawing in air with the fuel. Here's what you're probably looking for.> http://bradbarnett.net/mustangs/galaxie/tsb/tsb06-9-9hesonaccel.pdf

cowtown · Mar 25, 2008

Why fix it yourself? Takes a Ford tech an hour to replace it. I had mine done shortly after I got the car, made all the difference for the problem.

Art161 · Mar 25, 2008

Apparently this is a known problem with a known cure. I wouldn't take the chance of having the car hesitate at an inopportune time.

Khyron · Mar 25, 2008

I experienced this with my car too. So I printed out the TSB and took it to the dealer. They replaced my fuel pump with no questions. Definitely get it taken care of. Starving your engine of fuel is bad-bad-bad mojo.

stang8urimport · Mar 25, 2008

I'll fix it myself because I'm not takin' all the crap I have off to have it serviced.

ARTTII · Mar 25, 2008

I doubt a dealer would do anything about your problem anyway, since your car is a 2007. The problem was "fixed" before job1 2007MY. That is, unless they could recreate the problem....

anthony05gt · Mar 25, 2008

You're welcome.

LL2020 · Mar 25, 2008

Fuel pump TSB

Print out the TSB and take it to your dealer. Mine hesitated cause they could not "duplicate" the problem. Once the technician was in the car, I told him I wasn't taking him back till the car did it's thing. He was amazingly co-operative for almost being kidnapped. A highly recommend the Roush fuel pump if you have an authorized Roush dealer. I got the work done under warranty and only had to pay the price difference between stock and Roush pump. 10K+ and no more issues.

cowtown · Mar 26, 2008

Some people like throwing money away I guess.

Redfire 05 · Mar 26, 2008

I have the same problem, and I would like to get it fixed, but my car is beyond the 3 year warranty. Is this TSB something that would be covered by the dealer or will it be an out of pocket expense for me?

Emay · Mar 26, 2008

Cowtown, it's not throwing money away. Dawg's been through alot with mustang trouble recently. Rear end issues on his previous damn near gave him fits.

Rather than deal with the headaches of dis-proving all his aftermarket mods being the cause and eventually getting them to fix it, he is chosing to correct the problem on his own..

Fuel pump swap out on these cars is 30 minutes worth of work, all accessed from the back seat of the car. He would spend more time on the phone arguing about the mods, or pre-removing them to avoid the hassle.

Dawg, where was your fuel level at when it occurred?

If your on a long stretch and slow down without making a turn of any kind does the problem reproduce itself? Not the easiest to duplicate since most off ramps bend I know..

Have you had any of the fuel filling trouble that is common because of the split tank? It is a two way issue, filling to the far side and vise versa in drawing back to the pump on the pick up end..

stang8urimport · Mar 26, 2008

Thank you Emay... Couldn't have said it better myself.

As far as the problem... It's the first time it's ever happened. I had right between 1/4 and 1/2. I can't duplicate the problem either. I did not turn when this happened, as the exit it in the middle of the interstate (toll road with a gas stations every 50 or so miles, and it's build in the middle of the interstate). It was a straight shot... slowed down... put it in second and gave it a little gas.. and it stumbled for just a split second... then was fine.

As far as the filling problem... Absolutely I have it. I have to turn the pump up-side-down to get it to fill all the way. Another problem that really doesn't bother me, so I just deal with it as it's not causing any mechanical problems... just annoying. And I know it being an 07, it has the "replacement" tank from the factory.

Nick

Emay · Mar 27, 2008

Nothing like the good ole' cannot duplicate trouble routine. With as much fuel as your stating you had it wouldn't be a sloshing or pick up problem, definately a mechanical hiccup.

I'd travel the path of replacement if it occurs again. Pumps are finnicky, like anything else one minute they can be fine, and the next minute out of service.

The good news is they made these cars simple to work on in regards to the pump.

Maybe do yourself a favor and go after a GT40 or focus pumps. Just swap it onto your hat assembly and your done.

stang8urimport · Mar 27, 2008

Using the Focus pump or GT pump, no tuning is needed, right? The computer can compensation for the added flow?

Emay · Mar 27, 2008

That's my understanding. I'd confirm with a 2 minute call to Brenspeed or other just to be sure..

Fuel pump hesitation after driving long distances on highway.

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