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Your Brand-New Generator Cranks but Won't Fire? The Install Step Everyone Misses

Updated October 10, 2026

Your brand-new generator turns over strong, again and again, and then just... quits. The battery's obviously fine — you can hear it spinning over. So what's it waiting for? Here's the surprise: on a unit this new, it's almost never the engine. It's fuel that never actually made it in, because something got skipped the day it was installed.

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It's cranking, so the engine must be fine — that's the trap

Here's what throws everybody off. When your generator cranks, that strong, steady spinning means the battery's good and the starter's doing its job. Your gut says the hard part is already working, so the real problem must be something deep and expensive.

It's usually the opposite. An engine only fires when three things show up at once: fuel, spark, and air. On a unit that rolled off the line last month, spark and air are almost never the holdup. So the engine turning over strong isn't telling you the engine's fine — it's pointing straight at the one thing that never arrived. Fuel.

Generac units even keep score. The engine tries to catch five times, and if nothing happens, it quits and throws an overcrank alarm — code 1100 on the panel. People read that like a death sentence. On a fresh install, it's almost always the machine telling you it's starving.

The fuel got cut off before it ever reached the engine

So where does it go missing? A few spots, and they all happen on day one.

Start with the fuel solenoid. That's the little valve that's supposed to click open the moment the engine cranks and let gas through. It's held open by one skinny wire that ends in a plug about the size of a Chiclet. If that plug's left dangling during a rushed commissioning — and it's one of the easiest things on the list to skip — the valve never opens. The engine cranks its heart out into a closed door.

Then there's the fuel setting. A lot of these units can run on propane or natural gas, but somebody has to set them for the one you actually have. Get it backwards — plumbed for propane while the unit still expects natural gas — and it meters the wrong amount and won't catch.

And then the dumbest one: a shutoff valve left closed. There's one sitting right next to the unit, close enough to reach out and touch, and if it's shut, cranking does absolutely nothing. It's your gas grill clicking away with the tank valve still turned off. On a brand-new gas line there's a cousin to this too — air trapped in the pipe that never got bled out, so the first stretch of 'fuel' the engine pulls is just trapped air.

Why a fresh install is exactly where this hides

You'd think a problem this basic would turn up on a machine that's run for years, not one that's a week old. It's the reverse. An old unit already proved it can start — the wire's plugged, the valve's open, the gas is the right gas. All of that got settled the day it went in.

A new one hasn't proven anything yet. Commissioning is a checklist, and the fuel wire, the fuel setting, and that shutoff valve are boxes on it. Miss one and you've got a machine that looks perfect, cranks perfect, and never runs.

Florida makes the fuel step trickier than most places. Out in the county you're usually on a propane tank; in town you're on natural gas off the street. So every install here hits a real fork — which fuel, which setting, which regulator — and somebody has to get it right on the first visit. That's also why owners keep describing the same odd thing: it won't fire on auto, but hit the manual start and sometimes it coughs to life. That's not a ghost. That's a unit getting just barely enough to limp, which is the fingerprint of a fuel setup done wrong, not an engine that's broken.

What this actually means before you sign anything

The maddening part is that almost none of this is a bad generator. A cranks-but-won't-fire unit on day one is almost always something that got skipped on install day — a loose plug, the wrong fuel setting, a valve nobody opened. Which means the thing that actually protects you isn't the brand stamped on the box. It's whether whoever installs it gets the boring steps right and stands behind the work.

That's the whole idea behind how GENERasic quotes you. You put in your address and get one committed installed price for your specific home — the generator and the install that makes it actually start when the power drops, not a teaser number that balloons once the truck shows up.

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Common questions

Why does my brand-new generator crank but not start?

On a new unit it's almost never the engine. Cranking proves the battery and starter work — what's missing is fuel. The usual culprits are a fuel solenoid wire left unplugged, the unit set for the wrong fuel (propane vs natural gas), a shutoff valve left closed, or air never bled out of a brand-new gas line. All of those are install-day steps, not engine failures.

Mine starts on manual but fails on auto and shows a 1100 code. What's wrong?

Code 1100 is overcrank — the engine tries to start five times, fails, and shuts itself off on purpose. If it only limps to life on a manual start, that points to marginal fuel delivery: low gas pressure, a regulator issue, or the wrong fuel setting — not a dead engine. It needs the fuel side checked by a pro, not more cranking.

Can an installer really leave the fuel solenoid wire unplugged?

Yes, and it's one of the most common day-one misses. The solenoid is the valve that opens to let gas in when the engine cranks. If its connector is left hanging during commissioning, the valve stays shut and the engine cranks into a closed line — strong crank, no start.

Does the propane vs natural gas setting really matter?

It matters completely. The unit has to be set and plumbed for the fuel you actually have. A wrong selection or a skipped fuel conversion will keep it from starting. This trips up Florida installs especially, because county homes tend to run propane while homes in town run natural gas off the street.

Is it safe to just keep hitting start?

There's no point to it. The unit is built to stop after five failed tries and flag an overcrank, so hammering the button only drains the battery and can flood the engine. If it cranks but won't fire, stop and get the fuel side inspected rather than cranking it into the ground.

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