Might have found EFI fuel tank solution... from strange source

[Rusty67]

The fuel flowing through the pump is plenty to cool it. Don't forget that at below 1/4 tank the pump is no-longer submerged anyway....just the pickup.(although the pump will probably get "splashed" during driving anyway).

But I do agree with the noise comment... it's quieter inside a tank.

The reason they put the pumps in the tank is because high pressure pumps don't like to "suck" fuel...only push. The shorter the distance the fuel has to travel before reaching the pump the better.

Trust me, the cooling that the pump gets from being in tank over being external is quite significant.

 

[ForceFed70]

Trust me, the cooling that the pump gets from being in tank over being external is quite significant.

Sure...if that extra cooling was needed.

I recently did a test with my external 255lph pump because I was worried about it overheating. I pretty much wrapped the pump in a rubber-foam blanket so was a little concerned. I ran the fuel pump for over an hour straight (was also checking for any fuel leaks). After the 1hr, I pulled off the cover and put my hand on the pump. It was cool to the touch...

 

[Rusty67]

Street heat in LA traffic during the summer is not the same as the pump running in one location for an hour.

 

[ForceFed70]

Street heat in LA traffic during the summer is not the same as the pump running in one location for an hour.

The fact the car is moving or not makes no difference... in fact a moving vehicle would generate more airflow around the pump. If it's hot outside, the fuel in the tank will also be hot. My point was that my pump was cool to the touch..sure it might get "warm" in harsh driving conditions... but it's still not going to get hot enough to cause premature failure.

But regardless.. where are you getting your info from? Have you heard reports of cooling problems with external pumps.. or have any experience with pumps overheating in one of your vehicles? I've done a fair amount of research on EFI fuel systems and this is the 1st I've ever heard of external pumps having heat issues.

Sometimes extra cooling isn't needed. I could tell you that a radiator out of a semi would provide better cooling and I'd be absolutely correct...so should everyone install 4' tall radiators in their cars?

 

[Rusty67]

I'm not up for an argument on this one, but why not. Its a known fact. If you have done a lot of research and havn't come across this problem yet them I am supprized. Maybe where you live it doesn't get over 100 degrees during the summer. Or maybe your car isn't going to be a daily driver. Then in that case I'm sure it would be fine. I've lived in LA all my life and believe me, it gets over 105 a LOT in the summer time. And if its hot outside then its even hoter on the asphalt. I'll say it again because I don't think you caught this last time. In TRAFIC its a problem (in LA it tends to be very bumper to bumper during rush hour). These fuel pumps KNOW when to die. Its never right when your are pulling into your driveway at home. Its almost always when you are trying to make a left turn in the middle of the intersection or when you REALLY need to get somewhere and don't have 10 minutes to burn for the pump to cool off. I know a few people who have tried different brands of external fuel pumps and none have lasted here for more then 2.5 years.

As for the fuel in the tank geting hot. Thats not exactly true. It depends how much fuel is in the tank and how well insulated the tank is. I've never seen a tank that gets exposed to direct sunlight so all of the heat would come from conduction as opposed to radiation. I just can't believe that a full tank or even a 1/2 tank of gas would heat up to the outside temperature.