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External Fuel Pump list for FI Guzzis

GTM®

GTM®

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GT di Razza Pura
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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:

Old Jock said:
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.
Click to expand...
 
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
 
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