Fuel System Problems

JoeB1949

New Member
Apr 13, 2021
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Columbus OH
I have a 2003 Mustang GT that has fuel system problems. The car has 51,000 miles on it, I have owned it for about 2 years. I started having fuel rail leaks last year. The rails were replaced and I drove it for 3 months before winter storage. After the initial spring start and drive I started having starting problems. My mechanic diagnosed this as fuel pump problem. We are now on the third fuel pump. The first 2 failed in the tank with the lines burst on the pump itself. A Motorcraft pump is now installed but they are having different fuel pressure reading between mechanical pressure and what the computer is calling for. They think something else in the system is causing the leaks and the pump failures. I put a Borla high flow exhaust system on it last year. To my knowledge this is the only mod to the car. Any help would be appreciated.
 
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7991LXnSHO

wanna catch the space herp
10 Year Member
Sep 1, 2010
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Kearney, NE
We can give you two opinions in one thread if you want. :crazy:

It’s easier to get all the info in one thread, so please be patient and not do doubles regularly. :nono:


I am not as familiar with this generation, but it is not normal fuel pump behavior. Have you changed the fuel filter and the fuel pressure regulator? (Watch it be a part of the pump assy on this year). Is the return line clear?
 

HemiRick

I'd be looking at jacking under the house
Jun 28, 2020
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Memphis TN
EFI rated fuel hose wont burst until like 250 LBS of pressure.....So i suspect if that line in the tank burst twice they're not using the right hose. Also there's a special hose for being immersed in fuel too.
 
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