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Walbro HP 450 pump amperage

Old 12-02-2018, 02:58 PM
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Default Walbro HP 450 pump amperage

Anyone know the amperage draw on a Walbro HP 450 pump at full flow?
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Old 12-02-2018, 04:45 PM
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max at 13.5vdc it can pull 21 amps..depends on what pressure its at though. Realistically its like around 17 i believe
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Old 12-02-2018, 05:29 PM
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This link has voltage info:

https://bmw.spoolstreet.com/threads/...shootout.3538/

Real Street recently did a fuel pump comparison, per the blog
part two will have info on draw and heating characteristics:

https://www.realstreetperformance.co...t-performance/
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Old 12-02-2018, 07:03 PM
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Thanks guys. I'm trying to determine what amperage of a manual circuit breaker to purchase for the 8ga power cable. I'll be running 2 of these pumps, so I would guess that maybe a 50 amp circuit breaker would suffice?

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Old 12-02-2018, 07:16 PM
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Originally Posted by Spoolin View Post
Thanks guys. I'm trying to determine what amperage of a manual circuit breaker to purchase for the 8ga power cable. I'll be running 2 of these pumps, so I would guess that maybe a 50 amp circuit breaker would suffice?
I'm assuming your second pump will be activated by your ECU? While you could run a single circuit breaker, it would be recommended that you run 2 separate power circuits. If your main pump has issues it could burn up the wiring before the breaker pops.
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Old 12-02-2018, 07:26 PM
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Originally Posted by Charper732 View Post
I'm assuming your second pump will be activated by your ECU? While you could run a single circuit breaker, it would be recommended that you run 2 separate power circuits. If your main pump has issues it could burn up the wiring before the breaker pops.
Both pumps will be running at the same time. Good points but I had planned on running another blade style fuse at the junction that splits to each pump also. These will be 25amp fuses and the breaker will be used at the battery to run the main power of 8ga cable to the back.
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Old 12-03-2018, 01:22 PM
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We were seeing 22.5 amps on a walbro 450 set-up we had running with some small spikes higher.

They pull some amps.

The new walbro 525 deamon was found to pull about 15-18% more amps while flowing about 8% more fuel. So from that I would guess you could see around 25 amps of flow on a 525. All the installs I do I am using a minimum of 10ga wire and 30 amp relays.
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Old 12-03-2018, 07:10 PM
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Originally Posted by flexer View Post
We were seeing 22.5 amps on a walbro 450 set-up we had running with some small spikes higher.

They pull some amps.

The new walbro 525 deamon was found to pull about 15-18% more amps while flowing about 8% more fuel. So from that I would guess you could see around 25 amps of flow on a 525. All the installs I do I am using a minimum of 10ga wire and 30 amp relays.
Well, I ordered a 50 amp bussman manual reset circuit breaker for the main power and was going to run a 25 amp blade fuse to each pump. Hopefully this will suffice.
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