Fuel Leak ?

[kwikdraw]

My 1991 XLT has a fuel leak that disappears and then re-appears when the temp outside was above 60 you could see it leaking fuel at the back of the motor center the leak goes down and leaks on to the exhast crossover then on to the ground but when the weather is like today in the low 30's no sign of the leak according to my mechanic any ideas? thanks in advance -KD

 

[MrShorty]

I would guess the leak is from something attached to the fuel rail (fuel line, FPR, injector(s)). Just about any leak out of the fuel rail could trickle along the top of the engine until it gets to the back and trickle off.