Mustang sat for a while and won't start

put in some gas dryer, from autozone (methonol) May want to move car back and forth some to mix up tank check voltage on battery standing alone, if above 11.00 volts charge it up it should hold charge if not replace it then try to start car. [voltage starting sometimes on a dead battery dosent bring up the fuel pressure that high] Should start

let us know what happens

If the battery is at, or above, 12 volts with a portable battery pack on it is that ok? I don't have a charger. I did put a voltmeter on it with the battery pack and it was over 12 volts. I wasn't able to get any gas dryer. Would adding some fresh gas and gas dryer may it more likely to start if water in the gas is the problem?

If the battery is at, or above, 12 volts with a portable battery pack on it is that ok? I don't have a charger. I did put a voltmeter on it with the battery pack and it was over 12 volts. I wasn't able to get any gas dryer. Would adding some fresh gas and gas dryer may it more likely to start if water in the gas is the problem?

If the battery is at, or above, 12 volts with a portable battery pack on it is that ok? I don't have a charger. I did put a voltmeter on it with the battery pack and it was over 12 volts. I wasn't able to get any gas dryer. Would adding some fresh gas and gas dryer may it more likely to start if water in the gas is the problem?

12 volt means the battery can be charged up and should be good. one of the portable battery packs is too small to turn it over enough, like 10 times to get it running. Can you jump it? Ethanol (everclear) can also help, but dont add more than a pint to 1/2 full tank Methanol is better 1-2 months is usally too short for water in gas. Fresh high octane gas should help

Bet your battery is just low, and needs a jump from another car to start up.

My experience is that a jump start is needed. Not a battery pack. And get a trickle charger like a Battery Tender Jounior if a vehicle is going to sit unused. It doesn't take much to bring a battery down to low to crank the engine... especially in cold weather. In Maine, I took the battery inside the house when I got home... and ran a block heater. Same in ND, MN and AK. Could even have used it in IN.

I add a gallon of AVGAS (aviation fuel) to a tank every now and then to keep everything cleaned out. Don't know how it would work in a 2ooo (mine's a carbed 302 in a 65 Mustang). Pilots just hate to hear any sputtering sounds and then lose an engine while cruising .... it makes for a rough landing and has a tendency to ruin your day.

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Well, I put in a new battery, added Heet, and put 5 gallons of high octane fuel in. No start.

Now, I think it's a fuel pump issue. If I remember correctly when you turn the key on you would hear the pump kick in to fill the lines. I don't hear that now. I check the impact relay button in the trunk and it does not appear to have been tripped. I checked the #14 fuse in the power distribution center under the hood.

Any other ways to test the fuel pump?

Thanks! Shane

Well, I put in a new battery, added Heet, and put 5 gallons of high octane fuel in. No start.

Now, I think it's a fuel pump issue. If I remember correctly when you turn the key on you would hear the pump kick in to fill the lines. I don't hear that now. I check the impact relay button in the trunk and it does not appear to have been tripped. I checked the #14 fuse in the power distribution center under the hood.

Any other ways to test the fuel pump?

Thanks! Shane

should hear pump when you turn key 1/2 way.

there is a schadrader valve on the fuel line, Autozone should let you borrow a pressure gague that fits it, should have about 42 pounds pressure. however, if you push in the pin some gas should spray out some if pump is on or pressurized the line.

could be wiring from to fuel pump ? Key switch is involved, but I think it feeds other accessories as well when on 1/2 way. There may be a fuel relay involved, not sure of location, under front seat somewhere (Im thinking of older model stang, a 93) worth checking all the fuses, there may be two involved.

Also, check for a ground to wiring harness connector, a one pin connector near battery, sometimes it gets corroded and intermittent, and will cause all kinds of problems, including fuel pump.

Have you read the codes out?

The fuel relay for the 2000 is in the CCRM (constant control relay module). It's in the passenger fender. Should click with key on. Being that it doesn't get driven much it might be easy to forget to use a PATS key? Any flashing lights in the gauge area?

Well, I got it to start momentarily with some starting fluid. I checked all the fuses. I relay on the passengers side clicks. So, I suspect it must be the fuel pump. Funny thing is it had 1/2 a tank of fuel and I put in 5 gallons of fresh gas, so now the tank is full. Should be fun getting to the pump. I am going to try a pressure gauge on the fuel line first.

Thanks for all your help! I'll keep you all posted. Shane

I always had problems with the selonoid for the fuel pump. Dont know why but went thru more than one. '

I'm actually going through the OP's same problem right now with my 00 GT. I have voltage past the FPDM just before the pump, so looks like I may be doing that soon.