Do you frequently accelerate hard or corner rapidly with less than 25% full gas tank? Under hard acceleration the fuel in your tank probably all sloshes to the rear of the tank away from the fuel pickup. Likewise, under heavy cornering G's the fuel will travel all to one side of the tank, or the other.

I am not sure how well the Evo gas tank is baffled internally. But, under certain hard driving conditions you could be running the pump dry or starving it, creating cavitation and overheating. Maybe this could be a contributing factor to pump failure. Just a thought!

 

My Walbro isn't overheating. :-) I was just suggesting that all the fuel going through the pump is probably cooling the pump very effectively. I think people overlook this fact when considering pump temperature.

 

does it out of nowhere drop like two cylinders? i have been having issues, driving normal then that happend, car dies, wait a couple minutes then it starts right up. i wonder if its my pump, been thinking its wiring....

 

well i dont run it dry or brake/accelerate hard enough to cause the pump to overheat. it usually happens when im cruising. wether its 40mph or on the highway doing 80mph, once the fuel gets low(1/4 or less) is when its prone for the problem to arise. i was thinking maybe i should run thicker gauge wire. i know dsm's experience similar issues.

 

If it was me I would just play it safe and install a brand new Walbro. I like to get it with the install kit. They're cheap enough, aren't they? See if this cures your problem. You can also look into hotwiring the fuel pump, which consists in replacing the factory relatively pump wiring with 12 or 8 gauge wire(?). This will increase pump voltage up to about 13.5 volts.

 

I doubt it's the pump. I know several people running 400hp+ that run their cars under 1/4 tank at the track and it doesn't over heat. I also very rarely hear of pumps failing so if you have been through three already, I would start looking at other causes. Possibly a clogged filter causing the pump to work too hard, wiring, etc. Usually a pump fails cause the brushes get too hot, that's not something that usually goes away in a few minutes and then is fine. Good luck on the diag and keep us updated.

 

well i checked the filter & it was fine. so now im checking the wiring. since winter has hit though, i havent had any issues with it. anyhow, i'll keep ya updated.

 

well my vacumm line off the fpr blew off. yea. all good now.