External Fuel Pump list for FI Guzzis

[GT-Rx]

Fuel Pump Replacement for your external (out of tank) Guzzi:

- OEM pump: Weber PI-021
- Bosch Dealer, Bosch #0580464048, @$190-236.00 USD
- Pierburg #7.21565.70.0 -OR- 7.21287.53.0 *see notes below*
- NAPA "Carter/Federal #P72018" $174.43 USD
- Auto-Zone "Master #E7334" @$189.99 USD lifetime guarantee

Notes:

The model quoted above is the Pierburg #7.21565.70.0. This pump is almost completely identical in every way to the specifications of the Weber PI-021 which was originally supplied, some folks state their pump was PI-121, I have no idea of the differences between the 2.
The Pierburg has overpressure protection and a check valve to maintain system pressure like the original.
Physically the pump is a bit different. It is thinner but comes with a rubber isolating sleeve which will allow fitment to the original bracket. Likewise the inlet has a 12mm barb suitable for installation of the existing inlet hose. The outlet is different. The model quoted here comes with a female threaded M10x1.0 connection. The pump is supplied with 2 adapters which fit into that connection. These are an M12 and an M14 both 1.5 pitch banjo connections. I found a 12mm banjo to 8mm barb off E-Bay that should allow me to install the original hose, with a little bit of rerouting.
I chose to go this way as I broke off the original plastic outlet which had welded itself to the hose, there is a cheaper direct Pierburg replacement. That model is the 7.21287.53.0. This has a plastic high pressure end but instead of the threaded outlet, it comes with an 8mm barb so should slot straight in.

[Old Jock]

Fuel Pump specification

From the Sport 1100 manual (I think all the systems on this vintage are identical).

The pump operates at 100 l/hr at 3 bar, this is what the system runs at and is an industry standard. There are other standard pressures too but Guzzi run at the 3 bar. The pump is overpressure protected at 5 bar, via the discharge feeding back to the inlet. The pump has a non return valve to prevent the system draining down through the pump when it's switched off.

From this link you can pick up a pdf of the Pierburg range & there is a pump curve included in the documentation of the 2 applicable E2T pumps namely #7.21565.70.0. & # 7.21287.53.0.

http://seekpart24.com/pierburg/fuel-pump-721565700

John