1988 F-150 302
I replaced the fuel relay today and put 5 gallons of gas in the front tank, It will start right up then looses power but does not die, it will gain strength, then gasp again , finally dying out, you can start it back up and it will do the same thing. May I please have some help here? And Thank you in advance for your input.
Respectfully,
Tom Foley

 

Have you tuned it up latley? Maybe a fuel filter. Fuel pump?

 

What does it do when you run off the rear tank?? If it's the same thing, look to a fuel filter or inline fuel pump (I think these have 'em). If it runs fine off the rear tank, My guess would be the in-tank fuel pump in the front tank. Hopefully this'll help ya out.