Thread: Help with reading mV chart for fuel pump

The way I read it is that figure 5025 is milliamperes, not millivolts, i.e., the current drawn by the pump when running (5.025 amps).

What you are measuring is voltage drop E across the fuse. The fuse has a certain resistance R and, by Ohm’s Law you can calculate the current I drawn. The table assumes a specific (unstated) resistance for the fuses.

E=IR

Therefore I=E/R

Hi Ron,

thanks for the reply and clarification. I had assumed that 5025 should be divided by 1000 to get 5 amps but wasn't 100% sure, so thank you for that. The pump has lasted 9 years so probably due for retirement.

Cheers

You could loosen the pipe from the pump to the FPR and measure the pressure or observe the flow rate. Mine barley trickled out. The pump was gone.

Originally Posted by James NZ

Hi there,

I have a fuel problem, and I suspect the fuel pump to be the culprit. So reading through here I found this, Disco 2 - Check Td5 fuel pump HP | LandyZone - Land Rover Forum

So I had a read and did the test. my first reading was 2.4mV and the second attempt was 9.93 mV as per the picture. So reading the the attached chart it ends up with a figure of 5025. Is this mV's? I'm not sure how to read this. Should I have 23 mV showing on the multimeter? SF then talks about multiplication thru the chart. Is this where the figure of 5025 comes into play?

Any help would be appreciated.

Thanks, James NZ

Hi, i used the chart just to explain you dont have to use it to calculate... your multimeter seems to not have mV scale so set it to V and see what you get maybe it converts the reading which should be close around 23mV or you can calculate each way but if the result is that the pump's load is much below 15A then the pump's HP is gone, usually it's around 5A on LP but it can fluctuate

Originally Posted by Bohica

Mine barley trickled out. The pump was gone.

I couldn’t pick barley from wheat.

Originally Posted by p38arover

I couldn’t pick barley from wheat.

Barley is used to make beer.

Originally Posted by Bohica

Barley is used to make beer.

Mmmmmm beeer.

Beer.jpg

Beer has made me religous.

A wise man once told be that beer is proof that there is a god and that he loves us

Originally Posted by Bohica

Barley is used to make beer.

Ahh, that's my problem, I rarely drink beer. I bought a 12-pack of NZ beer early this year. I've finished off 2 of the stubbies so far. I can't see me finishing the carton before Xmas.

(Not because it's NZ beer, it's far better than that SA rubbish called Coopers. Coopers leaves a foul taste in my mouth. SA can make wine but they can't make beer.)