Fuel pump can't hang
 

It looks like the combo of increased horsepower and increased ambient heat is taking its toll on my fuel pump. It's a Walbro 255lph for an LT1 with the Racetronix hotwire kit, an adjustable FPR and Ford 30# injectors are down the line. I'm running 4 bar fuel pressure. I just drove the car a few hundred miles over the weekend in 90+ degree heat and my digital fuel pressure gauge showed that pressure was a few psi low. It would dip even lower with more engine load. During a few of my WOT passes on 2 lane highways, the pressure even fell to 3 bar (down around 43 psi). It did the same thing during a drag race weekend. Fuel pressure was falling into the 40's by my 5th race. Once it got later in the day and ambient temp dropped back into the high 70's, the pump would return to 58psi and hold even during WOT. I want to upgrade to a pump that was designed for 4 bar fuel systems and is able to handle 400 rwhp and daily driving in extreme heat. I already browsed ws6store but there are a bunch of options between racetronix, accel, walbro, aeromotive, holley, etc. I'd like to hear what people recommend. Also will a 98-02 pump be a direct fit for my 94? Is the electrical connector the same?