Endyn Fuel Pump
We have been using the Bosch pump for several years in most of our high performance applications.

The reasons for using this particular pump began when the Walbro / Holley pumps we'd used began to lose pumping pressure, while attempting to provide the necessary fuel output and volume necessary to feed engines with our modified Eaton blowers.

The conventional performance pumps were never intended to supply the high pressures needed for single injector systems. Single injectors of stock or moderate flow capacity are necessary because they will idle within legal limits, and in most systems using Honda ECU's, the flow rates are increased by a regulator to provide the fuel for boosted applications.

We've not seen an injector casualty yet, but the small diameter fuel pumps can't operate in these flow ranges, which are often in the 100 psi range. So the Bosch pump is actually a substitute for a fully programmable ECU and multiple injectors in supercharger systems.

As is evidenced by the photo, the Bosch pump is much larger than the Walbro unit and it's a tight fit in the fuel tank (the pump pictured has been shortened 1"), but it can be installed with the pick-up in the original location. For those who wish, the pump also works very well as an externally mounted unit too.

We've looked for a couple years attempting to find an alternate pump that is more compact and (in tank) friendlier to install, but when the diameter of the armature is reduced any, the performance takes a dive.

The best thing we can say is that unless you're making more than 750 hp, you'll never buy another pump for any reason.

We use it and recommend it for these reasons.

- The Old One 12/99

Pump Dimensions: Diameter 2.45" Length 7.50" (shortened)
Price: $239 stock Bosch, $279 modified by us (shortened to fit in stock location)

* Wiring is identical to the stock Honda pump *

Performance Data: Bosch 10208
psi flow in lbs/hr flow in gal/hr amps
000..... 405..... 67.50..... 05.4
020..... 375..... 62.50..... 06.9
050..... 320..... 53.33..... 09.0
070..... 300..... 50.00..... 10.4
100..... 250..... 41.66..... 12.2
120..... 210..... 35.00..... 13.3

Bosch Fuel Pumps
Bosch makes excellent fuel pumps. Porsche uses them in the 928 models. Bosch pumps don't flow much at 43 psi line pressure, but at very high line pressures they tend to flow better than other pumps. However, for our cars they are still inadequate for injectors larger than 450 cc/min. Considering that Bosch pump model 10208 is 2.45" in diameter and 7.5" long, which about 0.5" wider and 2" longer than our stock pump, and requires extensive modifications to the pump assembly to make it work, there are better choices that cost less, flow more, and drop right in. The only advantage the Bosch 10208 has over the other selections here is that it flows 158 lph at 100 psi line pressure, far better than any of the others.