Answer

Can the Pulsar G12KBN run Zoeller Model 53 3/10 HP sump pump, 115 V?

Runs

Runs. Running draw 1,116 W fits within 9,500 running watts. Startup watts were not published; 12,000 starting watts is at least 3× the running draw, the common planning allowance for a compressor or pump start.

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The comparison

Pulsar G12KBNZoeller Model 53 3/10 HP sump pump, 115 V
Running watts9,500 W1,116 W
Starting / surge watts12,000 WNot published
Typeopen-frame, Dual fuel (gasoline/propane)Pumps
Published runtime13 hr at 50% load on gasoline
SourcesGenerator sourceAppliance source

Questions

Can the Pulsar G12KBN run Zoeller Model 53 3/10 HP sump pump, 115 V?

Runs. Running draw 1,116 W fits within 9,500 running watts. Startup watts were not published; 12,000 starting watts is at least 3× the running draw, the common planning allowance for a compressor or pump start.

What watts were compared?

Generator: 9,500 running W and 12,000 starting W on gasoline. Appliance: 1,116 W running, startup not published.

How long will it run?

Fuel runtime depends on total load. Published runtime: 13 hr at 50% load on gasoline.

Where did the numbers come from?

Pulsar product page and manual: gasoline 12000 peak / 9500 rated; propane 10800 / 8550; 4 x 120V 20A, 120/240V 30A twist-lock, 50A, 12V DC; 8 gal; 13 hr at 50%. Zoeller lists the Model 53 at 3/10 HP, 115 V or 230 V, and 4.8–9.7 A. The 115 V automatic model in Zoeller's 50-series technical table is 9.7 A. Running watts used here are 9.7 × 115 = 1,115.5 W. Startup amps are not published. How often the float runs is site-specific, so no duty cycle is stored.

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