fuel pump rpm

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food111
Newbie
Posts: 1
Joined: Mon Aug 17, 2015 11:48 am

fuel pump rpm

Post by food111 »

hello

it is known that to check fuel pump by waveform analysis we must know pump rpm by waveform and some calculations and compared to specification, my question how to know rpm specification of any new pump the same model of that installed in the car ?


thank u

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vasek
TwoWaves
TwoWaves
Posts: 106
Joined: Tue Feb 17, 2015 7:27 pm

Re: fuel pump rpm

Post by vasek »

On the waveform You can see the current consumed by the pump,the difference between the maximum and minimum current,number of lamellae on the rotor,the speed of rotation.For most pumps turbine type , the value
of the speed of rotation is about 4400 - 5200 at a voltage of 14.4 .The difference current is of about 1.3 amps .There is a dependence on the type of fuel, voltage at the pump , number of lamellae and manufacturer.If no fuel in tank or faulty fuel suction jet pump ,current can be reduced noticeably ,and the speed will increase to 7000 rpm and more.This is true for all simple pumps,not for pumps with control ECU and 3 phase brushless pumps .Here's an
example of operation of the feed pump AUDI Q7 3.0 TDI BUG:
Attachments
fuel pump current.png

PicoPhil
Pico Staff Member
Pico Staff Member
Posts: 71
Joined: Thu Dec 23, 2010 11:38 am

Re: fuel pump rpm

Post by PicoPhil »

Hi
James Dillon does an excellent book called Oscilloscope Diagnostics and this subject is covered on pages 85 to 93. Excellent read.Go to either Technical topics or Diagnostic assistance.
:D

gbrodner
Newbie
Posts: 4
Joined: Sun Sep 05, 2010 3:31 pm

Re: fuel pump rpm

Post by gbrodner »

Hello,
is there anybody, who can explain me the particular periods of one cycle?
What is the reason for the alternating amperage and the clitches?
Thanks and greeting vom Munich
g.
Attachments
ford_escort_benzinpumpe_strom_04.psdata
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