English French German Italian Portuguese Spanish Swedish

rotax brp

 

Pierburg electric fuel pump

  • Wayne Hubbs
  • Wayne Hubbs's Avatar Topic Author
  • Offline
  • Fresh Boarder
  • Fresh Boarder
More
1 week 5 days ago #17533 by Wayne Hubbs
Wayne Hubbs created the topic: Pierburg electric fuel pump
What car year make and model does the Pierburg electric fuel pump fit on

Please Log in or Create an account to join the conversation.

More
1 week 5 days ago #17534 by Dale Atchetee
Dale Atchetee replied the topic: Pierburg electric fuel pump
Do you mean the fuel pump on the 912 which is a mechanical fuel pump?

Please Log in or Create an account to join the conversation.

  • Wayne Hubbs
  • Wayne Hubbs's Avatar Topic Author
  • Offline
  • Fresh Boarder
  • Fresh Boarder
More
1 week 5 days ago #17535 by Wayne Hubbs
Wayne Hubbs replied the topic: Pierburg electric fuel pump
No I want to buy a spare 12 volt pierburg pump that goes on a 914 Rotax engine. The pump is very expensive but if I had the car year and model that I feel sure it also goes on it would be much cheaper. I feel this pump was not designed just for Rotax but for a car and Rotax just adapted it.

Please Log in or Create an account to join the conversation.

More
1 week 3 days ago #17548 by Bill Hertzel
Bill Hertzel replied the topic: Pierburg electric fuel pump
While Pierburg is an exotic name in the US, It is an off the shelf supplier of automotive parts in Germany/Austria where Rotax is located.
It will likely be found in many eastern European made automobiles.
Look at Audi, BMW, Mercedes, Opel, Porche, or Volkswagen.

Most modern Automobiles have the fuel pump internally submerged inside the fuel tanks.
The external style pump you are looking at is likely an aftermarket product used in Performance/Racing applications.

There is nothing especially "Aerospace" about the pump.
Any locally available Fuel Pump of similar specifications will work.

Read the Part number off the pump and head for your local auto parts store.

Please Log in or Create an account to join the conversation.

  • Wayne Hubbs
  • Wayne Hubbs's Avatar Topic Author
  • Offline
  • Fresh Boarder
  • Fresh Boarder
More
1 week 3 days ago #17551 by Wayne Hubbs
Wayne Hubbs replied the topic: Pierburg electric fuel pump
Thanks Mr. Hertzel for your help, I have a daughter that lives in Germany I think I will give her the pump part number stamped on it and see if she can find it at a part store in Germany.

Please Log in or Create an account to join the conversation.

  • Wayne Hubbs
  • Wayne Hubbs's Avatar Topic Author
  • Offline
  • Fresh Boarder
  • Fresh Boarder
More
1 week 3 days ago #17552 by Wayne Hubbs
Wayne Hubbs replied the topic: Pierburg electric fuel pump
I have taken the pump off and carried it to all of our local part stores and none of them can help me unless I can give them the make model and year of the car it fits on.

Thanks

Please Log in or Create an account to join the conversation.

More
1 week 3 days ago #17554 by Bill Hertzel
Bill Hertzel replied the topic: Pierburg electric fuel pump
This should not be this difficult!

As I stated earlier, it is highly unlikely you will cross reference your "External" pump to a production automobile.

What is the Part Number stamped on the pump?

The internet is your friend.
Just search the part number.

Check out THIS as a start.

Again, What is the Part Number stamped on the pump?

Please Log in or Create an account to join the conversation.

  • Wayne Hubbs
  • Wayne Hubbs's Avatar Topic Author
  • Offline
  • Fresh Boarder
  • Fresh Boarder
More
1 week 2 days ago #17559 by Wayne Hubbs
Wayne Hubbs replied the topic: Pierburg electric fuel pump
TI-Automotive Poland
10T251
7.21440.78
996 738
10.0650

Please Log in or Create an account to join the conversation.

More
1 week 2 days ago - 1 week 2 days ago #17560 by Bill Hertzel
Bill Hertzel replied the topic: Pierburg electric fuel pump
Internet says...

Pierburg 7.21440.78 pump was used in...

Renault - 5 Super 1.4 Turbo GT (C405) --- A.K.A. Renault R5 GT Turbo (1397cc)
Engine Code 840.730
Jan 1985 to May 1991

It is on the Pierburg Sheet as one of the most commonly used designs.

Imperial Specs would be
12 volts
Medium pressure,
15 psi @ 25 gal/hr Nominal Flow
25 psi Max Static Pressure
1/2" Inlet, 3/8" Outlet.

You are looking for a Universal Style Fuel pump (~15psi) for Throttle Body Injected (TBI) Turbo Charged engines.
NOT the more typical Multiport Injected (MPI) engines that typically inject at 40-70 psi

A Walbro GSL395 would be a reasonable replacement.
It doesn't look like you will find a replacement for under $100 USD.
Last Edit: 1 week 2 days ago by Bill Hertzel.

Please Log in or Create an account to join the conversation.

More
1 week 2 days ago #17561 by spiros economou
spiros economou replied the topic: Pierburg electric fuel pump
Hi to all,

The Pierburg's pump model is E1F and is a generic pump model for several automobil installations. This is the exact pump Rotax uses in 914. Pireburg part no 7.21440.78.0 .

Please Log in or Create an account to join the conversation.

  • Wayne Hubbs
  • Wayne Hubbs's Avatar Topic Author
  • Offline
  • Fresh Boarder
  • Fresh Boarder
More
1 week 1 day ago #17564 by Wayne Hubbs
Wayne Hubbs replied the topic: Pierburg electric fuel pump
First I want to thank you gentleman for helping me find the proper exact pump that is on my Rotax 914 , I think the main thing is pump pressure, I believe 7.5 to 8.0 psi. is about the maximum pressure Rotax recommends, my pressure runs about 5.0 to 6.0 psi. And I think that is about .5 bar.

Please Log in or Create an account to join the conversation.

More
1 week 1 day ago #17566 by spiros economou
spiros economou replied the topic: Pierburg electric fuel pump
The pump might be delivering around 1 bar or 14,5psi but between the pump and the carbs there is a pressure regulator installed (only in 914). This regulator monitors the airbox pressure and adjust the fuel pressure to be always higher by ~0.25 bar. So, the actual pressure that is delivered to the carbs has nothing to do with the pump. It has to be high enough for the regulator to operate correctly. Fuel pressure in a 914 is always different than the pressure we see at a conventional pressure gauge. Only if we can measure the difference between airbox pressure and the outlet pressure of the regulator, we can have a clear indication of how our fuel system is operating. In 914, Rotax wants to have always higher pressure in the carbs than the airbox pressure, in order to avoid mixture going lean. In a turbocharged engine you always want the mixture to be on the richer side and prevent damage to the engine.

Please Log in or Create an account to join the conversation.

More
1 week 1 day ago #17569 by Bill Hertzel
Bill Hertzel replied the topic: Pierburg electric fuel pump

Wayne Hubbs wrote: First I want to thank you gentleman for helping me find the proper exact pump that is on my Rotax 914, I think the main thing is pump pressure, I believe 7.5 to 8.0 psi. is about the maximum pressure Rotax recommends, my pressure runs about 5.0 to 6.0 psi. And I think that is about .5 bar.


Don't confuse Gauge Pressure with Airbox Differential pressure.
Gauge pressure will vary with throttle and altitude.
Differential pressure is constant and controlled by the Fuel.regualtor.

Maximum Fuel Pressure is ~5psi ABOVE the AIrbox Pressure.
Normal Fuel Pressure is ~3.5psi ABOVE the Airbox pressure. (Differential.)

At WOT(39" MAP) this would require ~8 psi Gauge Pressure at Sea Level and ~12 psi above 10,000 ft.
This is why the pump is capable of 15psi at 25 gal/hr and 25psi peak.

A 6psi Gauge Pressure would be typical of a cruise at ~24 inches of manifold/airbox pressure.

Please Log in or Create an account to join the conversation.