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Old 06-04-2011, 01:57 PM   #1
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Help please

Hey I have a 1990 mustang gt it has been stalling out while I drive it but I replaced module distributor plugs wires coil and fuel pump but don't know if the guy who did it put the new hose the pump comes with and he didn't clean the tank but u put a pressure gauge on it when it sits a minute and I try to crank it it runs fine 30lbs of pressure then I can let it run and rev it it starts to stall and the pressure goes to 0lbs and will not restart until it sits a minute but the pump is priming 30lbs but as it is sitting there the pressure will leak Down to 0lbs in like 10 minutes any advice is helpful thanks
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Old 06-04-2011, 02:24 PM   #2
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When it does die, is it at idle or when you at driving it?
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Old 06-04-2011, 07:18 PM   #3
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Re: Help please

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Originally Posted by 90blue5.0gt View Post
Hey I have a 1990 mustang gt it has been stalling out while I drive it but I replaced module distributor plugs wires coil and fuel pump but don't know if the guy who did it put the new hose the pump comes with and he didn't clean the tank but u put a pressure gauge on it when it sits a minute and I try to crank it it runs fine 30lbs of pressure then I can let it run and rev it it starts to stall and the pressure goes to 0lbs and will not restart until it sits a minute but the pump is priming 30lbs but as it is sitting there the pressure will leak Down to 0lbs in like 10 minutes any advice is helpful thanks
Possibly the fuel pressure regulator is bad.
Did you replace the fuel filter too?
The pressure should be at 38-39 lbs for the car to run properly.
It should hold that pressure for about 10-15 minutes after shutdown.
Yours is holding the 30 psi for 10 minutes so it is borderline as the pressure is already low.
This usually indicates a bad regulator with a pinhole in the diaphragm.
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Old 06-05-2011, 08:41 AM   #4
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Ok yea I changed the filter and it dose it when I'm driving it and idling just sitting there but I did not change the regulator
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Old 06-05-2011, 10:03 AM   #5
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Oh yeah and it will drive fine for a couple weeks then act up I drove it to orange beach al and no problems that's when I changed distributors new module and ran fine ran fine for a while then did this again so idk but hopefully something simple love the stang man it kills me to have to drive a Honda when I'm used the single chambers
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Old 06-05-2011, 10:15 AM   #6
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I can't begin to tell ya lmao, mine is doing the same except only at idle, getting in baton rouge traffic has made me stop driving it to work
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Old 06-05-2011, 11:23 AM   #7
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Re: Help please

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Ok yea I changed the filter and it dose it when I'm driving it and idling just sitting there but I did not change the regulator
Do you have a stock or aftermarket adjustable regulator?
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Old 06-05-2011, 12:03 PM   #8
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Stock I'm guessing I've never looked at it I don't even know where it is but I'm sure it's stock when I bought the car everything was stock but flowmasters but I'm hoping it's something simple
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Old 06-05-2011, 12:04 PM   #9
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Originally Posted by Stang.racr
I can't begin to tell ya lmao, mine is doing the same except only at idle, getting in baton rouge traffic has made me stop driving it to work
Yea it sucks when you block 40 cars at a red light and have to tell them to go around lol
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Old 06-05-2011, 12:21 PM   #10
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Re: Help please

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Stock I'm guessing I've never looked at it I don't even know where it is but I'm sure it's stock when I bought the car everything was stock but flowmasters but I'm hoping it's something simple
If it is still the stock regulator you might want to go ahead and replace it just to be sure.
You may also need to check into the installation of the new fuel pump to ensure it was properly installed.

From what you are telling us it sounds like it is fuel related, so I would concentrate in that area. You may also need to check or replace the fuel pump relay. It could be malfunctioning too.
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Old 06-05-2011, 12:23 PM   #11
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Re: Help please

30 PSI is low, and 0 PSI is lower.. Focus on fuel, who did the fuel pump, was it properly installed, did they replace the sock in the tank? Is the tank clean or dirty? Is the fuel line bent/crushed/damaged at any point from the tank to injectors?
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Old 06-05-2011, 12:36 PM   #12
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Quote:
Originally Posted by Trojan Horse

If it is still the stock regulator you might want to go ahead and replace it just to be sure.
You may also need to check into the installation of the new fuel pump to ensure it was properly installed.

From what you are telling us it sounds like it is fuel related, so I would concentrate in that area. You may also need to check or replace the fuel pump relay. It could be malfunctioning too.
Ok cool sounds like a plan I hope this is it man
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Old 06-05-2011, 12:38 PM   #13
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Quote:
Originally Posted by MonteCitan
30 PSI is low, and 0 PSI is lower.. Focus on fuel, who did the fuel pump, was it properly installed, did they replace the sock in the tank? Is the tank clean or dirty? Is the fuel line bent/crushed/damaged at any point from the tank to injectors?
Yes I did replace the sock and it will run fine 4 a while and then it will start acting up but it will be worth it when I replace all this
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Old 06-05-2011, 12:51 PM   #14
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No I don't think he cleaned the tank because he didn't wanna have to get all the gas out so he probably didn't doit right and he is well known to Half *** stuff which I didn't know then what I know now but it's ok
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Old 06-12-2011, 09:31 PM   #15
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Hey guys I found out what it was hopefully me and my dad dropped the tank and replaced the fuel pump the sock and fuel filter and the rubber hose and now it has 35 pounds at idle it stays at thirty and when the pump primes with the switch on it jumps 45lbs and I'm so excited about it thanks guys
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Old 06-12-2011, 10:41 PM   #16
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Re: Help please

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Hey guys I found out what it was hopefully me and my dad dropped the tank and replaced the fuel pump the sock and fuel filter and the rubber hose and now it has 35 pounds at idle it stays at thirty and when the pump primes with the switch on it jumps 45lbs and I'm so excited about it thanks guys

Great!
However your fuel pressure is still low. It could possibly lean out your engine and cause some damage.
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Old 06-13-2011, 08:53 AM   #17
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What's normal fuel pressure
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Old 06-13-2011, 11:42 AM   #18
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Quote:
Originally Posted by 90blue5.0gt
What's normal fuel pressure
Without the vacuum line attached it should be at 39 lbs. With it attached it should be approx 30 lbs at idle.
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Old 06-13-2011, 05:32 PM   #19
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Re: Help please

From Haynes Manual:

Fuel System Pressure (@ idle)

Vacuum Hose Attached: 30 - 45 psi

Vacuum Hose Detached: 40 - 50 psi

Fuel System Hold Pressure: (after 5 min.) 30 - 40 psi

Max Fuel Pump Pressure: 65 psi

Fuel Pump Hold Pressure: 50 psi
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Old 06-13-2011, 08:16 PM   #20
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Well how do you adjust the pressure and what's the best way to get a haynes or Chilton books at my local parts stores
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Old 06-13-2011, 08:20 PM   #21
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Originally Posted by 90blue5.0gt
Well how do you adjust the pressure and what's the best way to get a haynes or Chilton books at my local parts stores
To answer the second question: your local autozone or other parts stores should have one.
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Old 06-13-2011, 08:40 PM   #22
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Re: Help please

To answer the first question: You can't unless you have an adjustable regulator.
If you have a stock regulator you can replace it with either another stock regulator or an adjustable regulator.
I like these regulators myself. Kirban
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Old 06-14-2011, 03:03 AM   #23
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Quote:
Originally Posted by Trojan Horse
From Haynes Manual:

Fuel System Pressure (@ idle)

Vacuum Hose Attached: 30 - 45 psi

Vacuum Hose Detached: 40 - 50 psi

Fuel System Hold Pressure: (after 5 min.) 30 - 40 psi

Max Fuel Pump Pressure: 65 psi

Fuel Pump Hold Pressure: 50 psi
What Haynes manual are you reading because that sure isn't in mine except for 30-45 psi and even that isn't specified with or without vacuum.
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Old 06-14-2011, 06:18 AM   #24
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Hey guys thanks for that info guys I will try to find a manual or something
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