Hello I have a 68 bronco which has a 87 5.0 ho in it so im sorry I don't have a mustang, but my bronco has a heart of one 
either way I am having problems and I was hoping you could help. The person who did the conversion has two fuel pumps one low pressure in the back right by the fuel tank and the other one is in the engine bay. The bronco started to bog down and back fire whenever I tried to give it more throttle. It idle fine and start up fine until I started to press the gas. To get up to speed I had to ease into it slowly. Either way I tried testing the fuel pumps. First I made sure they were both turning on which they were. Then I routed the fuel lines around the front pump to bypass it and the rear wouldnt work then I routed around the rear and the front worked. I replaced the rear fuel pump with a low pressure pump which is supposed to have more suction. It ran awesome for like a day and this morning same exact thing. I noticed when I started it up in the morning the front pump started to sound like it was going to give up. So I am sure that I will have to replace it. My problem is I started to drive it halfway to work and it started to do it so I turned around to just park it and take the wifes car. Before I left though I tried to shut it off and turn it back on again and both fuel pumps turned on when I turned the key over, but the engine didnt turn over. I love my bronco but this whole fuel pump issue is getting out of hand. I really need some help I dont know if the engine not turning over is connected to the fuel pumps or what please help....
either way I am having problems and I was hoping you could help. The person who did the conversion has two fuel pumps one low pressure in the back right by the fuel tank and the other one is in the engine bay. The bronco started to bog down and back fire whenever I tried to give it more throttle. It idle fine and start up fine until I started to press the gas. To get up to speed I had to ease into it slowly. Either way I tried testing the fuel pumps. First I made sure they were both turning on which they were. Then I routed the fuel lines around the front pump to bypass it and the rear wouldnt work then I routed around the rear and the front worked. I replaced the rear fuel pump with a low pressure pump which is supposed to have more suction. It ran awesome for like a day and this morning same exact thing. I noticed when I started it up in the morning the front pump started to sound like it was going to give up. So I am sure that I will have to replace it. My problem is I started to drive it halfway to work and it started to do it so I turned around to just park it and take the wifes car. Before I left though I tried to shut it off and turn it back on again and both fuel pumps turned on when I turned the key over, but the engine didnt turn over. I love my bronco but this whole fuel pump issue is getting out of hand. I really need some help I dont know if the engine not turning over is connected to the fuel pumps or what please help....
