at idle. I'm slowly getting my VE tables where they should be (don't have a lot of time to play) and I'm within 4% of 128 across the board. But I've noticed a problem. Over the last few months, when I've had time to mess with my bin, I've noticed that my BLMs will creep from 128 at idle to the upper 150's. They will stay at or very close to 128 for a minute or two, then start thier slow climb. This weekend I took a 300 mile trip and almost didn't make it back. The engine would die every time I let off of the throttle.

I'm attributing all of this to a 17 year old fuel pump. I *think* the dieing was caused by a combination of age and heat combined with a slightly lean mixture.

I just wanted to check with the experts here before I pull the tank and go throught the hassle of replacing the fuel pump.

BTW, I would like to hear some recomendations for a good replacement that has the capacity for future mods.


TIA!

 

Idle is usually one of the last things affected by a fuel pump. It requires the least amount of flow. Get a fuel pressure gauge on there and see for yourself. Did it have hesitation or lower power while accelerating or driving?

 

I don't have a pressure gage, but the engine is definately starving for fuel when it dies. Another thing, this only occurs when the weather is very warm combined with a long drive. I changed the fuel filter but the old one was only slightly dirty. This is one that I'm having a hard time deciphering.

 

I guess it could be boiling the fuel or the pump, but a pressure gauge is still a better investment at this time. Maybe rent one, or borrow one.

 

One other tidbit of info that I forgot. If I'm remembering correctly, it had 1/2 a tank or slightly less the time (DC to Charlottsville in a full sized Blazer running at 70 mph + and dealing with the traffic coming out of DC). Just wondering if the warm temps (upper 90's) combined with 15 gallons of gas and the pump's age let it get warm enough to cause problems?