How Many Amps Does A Fuel Pump Draw

Fuel Pump Amperage

27 Aug 2022 09:49 #12369 past karim

Dears,

I did a electric current ramp test on 3 cars. All showing nice and even bumps of waveform only the amperage is around 600mah while Idling. I snapped the throttled just no amp increased.

Is this normal? Does fuel pump amp increase under load? what if it doesn't?
Does the waveform only show mechanical of commutator?
How tin can I know if a fuel pump doesn't take expert psi using waveform?

Any answer is highly appreciated.

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27 Aug 2022 ten:22 - 27 Aug 2022 x:23 #12371 by Tyler

karim wrote: I did a electric current ramp test on 3 cars. All showing prissy and fifty-fifty bumps of waveform but the amperage is effectually 600mah while Idling.

600 mAh? Did yous mean half dozen amps? 'Cause that's a pretty typical fuel pump current draw.

I snapped the throttled merely no amp increased.

Is this normal? Does fuel pump amp increase nether load? what if it doesn't?

That's non unusual at all! :cheer: In the case of a mechanical returnless or return system, the fuel pump is running at full speed whatever time information technology's on. Information technology'due south all down to the pressure regulator to make sure that fuel force per unit area keeps up with need. In other words, the pump never knows if you're idling, cruising or WOT, information technology just keeps pumping as hard as information technology can. :lol: On these systems, the merely time you'll see significant changes in pump current is during cranking, when bombardment voltage is low.

The variable here is electronic returnless systems, which WILL change pump current draw with changes in engine load. Though, on most systems I've seen, you simply run across big changes during cranking and very heavy load.

Does the waveform simply bear witness mechanical of commutator?

It mostly shows the electric integrity of the pump, just in that location are a few mechanical issues it tin can pick upwards on. One would be worn pump bushings/bearings. Very high current draw could bespeak a seized pump. Very low draw could indicate a loftier pressure leak inside the tank, or low fuel level.

How can I know if a fuel pump doesn't have practiced psi using waveform?

You tin can't. :-( Not with any real accuracy, anyway. Unfortunately, it'south entirely possible to take a pump that's cartoon reasonable current, but non producing plenty pressure or book. In that location are extreme cases that you Tin can make generalizations, similar if a pump is drawing one amp. You lot don't need a gauge to know that pump isn't moving much fuel. :lol:

Concluding edit: 27 Aug 2022 x:23 by Tyler. Reason: quotes are difficult

The following user(south) said Thank You lot: karim

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27 Aug 2022 11:22 #12374 by karim

Thank yous very much Tyler
God sent you lot to teach me. I practice appreciate your try of helping me. You are right correct 600 mah means 6 AMP since I am on conversion low amp probe.

I actually learned much from y'all. At present information technology is articulate every bit a blueish sky to me.

Have a great weekend

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