info@oldtimerteile.net | +49-2599-92210 | Mon – Fri, 8:00 am – 12:30 pm

Membrane

BMW 700 carburetor and air filter

Membrane Zoom

Membrane

€54.90

incl. 19% VAT plus shipping

for fuel pump, consisting of:
1 piece diaphragm with spring, completely ready for installation
1 piece gasket, top, B7-04-062
1 piece gasket, bottom, B7-04-066
1 piece gasket, B7-04-050
2 insulating bushes
Technical data
Category
BMW 700 carburetor and air filter
BMW part number
13310075780
Item number
B7-04-044
Weight
0 kg
In stock

No instant purchase: after your request you will receive a personal quote including shipping costs.

Philipp Schäper
Philipp Schäper BMW Isetta specialist Question about this item?
In stock Almost all parts available directly from stock
Original parts Original parts from workshop inventory
Specialists The specialists for BMW Isetta, 600 & 700
Worldwide shipping By DHL, UPS or freight forwarder — safely packed
Application

A diaphragm in the mechanical fuel pump separates the fuel chamber from the drive mechanism and, through its reciprocating motion, ensures the specified delivery pressure and a continuous supply of fuel to the carburetor.

Share

Recommendations

Frequently bought together 15

Questions & Answers

No questions about this item yet. Feel free to ask the first one.

Please sign in to ask a question about this item. Alternatively, you can reach us via the contact form.

Sign in Register To the contact form

General information about this item

Product info
The diaphragm with spring, part number B7-04-044, generates the actual fuel delivery motion to the carburetor in the BMW 700’s mechanical fuel pump and reliably seals the pump chamber. The set, which includes all necessary gaskets and insulating bushings, enables a professional overhaul of the original fuel pump, thereby eliminating leaks and delivery issues. Especially during restoration, replacing hardened or cracked diaphragms is crucial for reliable engine operation.

Database ID: 4687 Accessed on: 21.06.2026 23:47 Data state: 22.05.2026 12:33 In stock since: 18.11.2025