OBehave

Can the Bosch 044 fuel pump be used for an internal tank application or strickly outside the tank? I have to replace the fuel cell in the Hanson car and wanted to put all new stuff back in when it gets here.Right now for some reason there are 3 pumps in there but I don't know why but I'm sure I'll find out when I open it. I'm running at the moment 60psi with the ITB's so the 044 should be fine unless it's not rated for internal use. Thanks,
Ed

heinrich

Ed, I believe consensus was that the sole purpose of the in-tank pump was to prime the external pump in hot environments where the fule on the intake side of the external pump "boils".

I also believe that consensus was that it might be better to replace it with an 87 - 88 strainer and do all your power pumping on the outside.

I have not heard of anyone trying to instal an 044 inside the tank but it sounds like a bad idea to me.

OBehave

Thanks for the reply Heinrich. I read the threads on eliminating the in tank pump but that is for a stock system. The fuel system uses a 22 gallon fuel cell and 3 fuel pumps that are inside the cell. I would like to keep the configuration I have but I could not find anywhere if the "044" pump is rated for in tank use or not.Keeping the pump submerged in the cell keeps it cool also just a pain to service.
Ed

brutus

It can be a challenge with a fuel cell to avoid poor pickup issues. Hard cornering sloshes the fuel to the sides and uncovers the pickup gulps air and the engine stumbles. The current three pump set up no doubt is pulling from different points in the cell for that reason.
There ideal solution is adding a small tall accumulator maybe one gallon cell which you hook to your 044. Then use a high volume low pressure lift pump to transfer fuel into the accumulator. Plumb the return fuel line back to the accumulator with an over flow back to the main fuel cell. That way your 044 has a constant supply, the lift pump can gulp air from time to time, you can then use all the fuel in the main cell or run with a lower fuel level less weight longer runs.

jorj7

I run a 044 in the fuel cell. I also have one outside the cell that runs in parallel when needed.
The one inside feeds from an internal sump in the center/back of the fuel cell and the one outside
is feed from an ATL "duck foot". I have to work on the internal pump supply line. I think there
is a leak at the inline fuel filter, as it starts to draw air between 1/4-1/3 of a tank. Both pumps
are controlled at the front by switches, so I can run either pump or both at the same time. I
need a llittle more gas then one 044 can provide when under full load, but since most of the time
I'm not at full load, one pump works fine. With one pump there is less gas flowing to heat up the gas.

jorj7

Here's a diagram of the fuel system. I had a problem when only running one 044 pump. I was loosing
fuel pressure under full load. First I swapped out the fuel pressure regulator, then I upgraded
the pump to a single high flow/high pressure one, first a Fuelab, then an Aeromotive, but I would have
fuel overheating problems. I added coolers, insulated the fuel lines, added a larger feed line from the
pumps to the engine, and doubled the return line. Now the fuel temps seem to be under control,
but I'm still open to suggestions.

OBehave

Thanks for you reply George. You have a very complex fuel system there. Since I have never run this car on track yet I don't know if temp will be a problem for me yet. What is here is supposed to be what Don was using previousley and none of the log books shows any issue with temp or supply. I'm not sure just yet what pumps are in there but I wanted to "upgrade" when I replace the cell.I am giong to assume there are 2 small corner pumps feeding into a surge tank and the main pump supplies the pressure.I will know by weeks end.
How come you have such a problem with fuel temp being so high?
Ed

jorj7

Ed,

If I knew for sure why the fuel temps were getting so high, I could have fixed it a long time ago.
It started when I replaced the old fuel system, which wasn't able to keep up with the higher power.
There was also an engine replacement, exhaust, intake, and breather changes made.
I just know that I was getting temps of over 136 degrees in the fuel cell, this plus going up to
6,000 feet elevation caused the fuel pump to start cavitating. Didn't do it at sea level, but I would
get more knocks.