Fuel pump update

phunk

The only difference in the later hats, that makes any difference at all to the user, is a different harness connector. Earlier than that, there was a revision to put a spring on each of the 2 rods, but that doesn't solve anything.

Any anti-starvation kit installed to the left side of the tank, will all require repairing/replacing the top hat on the right side of the tank.

CJM has a surge tank add-on kit nearly available for the twin pump, which is a full right side replacement... but as you have observed, to run that twin pump requires a return fuel system since it does not have a regulator or filter integrated to it like the stock unit does. Mostly just because there is no space for those when a second pump is added. A fabricator could put those components in place of the second pump, but it would not be too simple thus not inexpensive unless you were familiar enough to make those modifications yourself.

You asked about ways to improve the siphon... that is a yes. You can improve the siphon and accelerate fuel recovery to the right side of the tank. If you installed a larger output fuel pump, and put in perhaps a pair of venturi pumps on the pressure side of the system, you could easily add 150-160lph of left to right transfer on top of the stock venturi system. It should help reduce slosh starvation a lot, but there are no guides / how-to for doing this, so you would be a little on your own other than some advice I could lend. Without having tested such a setup, I have no comment to what extent it would reduce or prevent slosh starvation.

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