UIM · Fuel

Aftermarket fuel injection system, UIM

GP2 is the first class in either division to allow it.

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This is one body's answer, not the sport's. You are bound by whichever body sanctions the event you enter. If you race more than one series, build to the stricter answer. The differences are set out in the rulebook comparison.

Where it stands, class by class

19 classes, grouped where the same rule gives the same answer rather than listed one by one, because an answer that holds for a class usually holds for every class that borrows its rules. 5 of them borrow another class’s rules and are marked below; for those, the link to the parent class is read from the categories table rather than stated in the rulebook. 8 publish no rule for this part and name no parent to borrow one from, and are grouped together at the end.

What each answer below means

Not legal

This comes off. The rules refuse it in this class.

Legal, with conditions

Keep it, but measure it: the rules permit this part only inside stated limits.

No rule, this is an open class

Probably keep it. The class carries no stock clause at all, so anything unlisted appears to be open. The rulebook does not say so in terms, and this is our reading rather than a permission anybody wrote down.

No rule published for this class

Unanswerable here. This class publishes no rule for the part and names no parent class to borrow one from, which is an absence in the rulebook and not a permission.

Not legal 3 classes

No fuel-injection allowance exists for Ski GP3.

• Ski Division GP3 · 501.02
• Ski Juniors GP3.2 · 302.01 · borrows another class
• Ski Juniors GP3.3 · 302.01 · borrows another class

Not legal 1 class

Aftermarket fuel injection is NOT permitted in Runabout GP3 - the concession starts at GP2.

• Runabout GP3 · 502.02

Legal, with conditions 2 classes

Permitted subject to SAE J30R9 high-pressure hose, A.N. threaded fittings or equivalent with non-removable crimped clamps, metal-type filters only on the high-pressure side, and a fuel pump that stops automatically when the engine shuts off.

• Runabout GP2 · 502.03.05-03
• Ski Division GP2 · 501.03.05.03

No rule, this is an open class 3 classes

No induction article.

• Ski Division GP1 · 501.04
• Ski Ladies GP1 · 314 · borrows another class
• Ski Veterans GP1 · 302.01.05 · borrows another class

No rule, this is an open class 2 classes

No article.

• Runabout GP1 · 502.04
• Runabout Veterans GP1 · 302.01.05 · borrows another class

No rule published for this class 8 classes

No component rules are published for this class and no single parent class is named, so this part cannot be answered for it. That is an absence in the rulebook, not a permission.

• Endurance · 317.03
• Freestyle Amateur · 312
• Freestyle Free · 312
• Jet Raid · 317.01
• Offshore · 317.02
• Parallel Slalom · 313
• Ski Future Electric (SFE) · 302.01
• UIM Hydro-Fly · 900

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Aftermarket fuel injection system: if the rule your class applies reads differently to you, or the rulebook has changed since this was read, ask. We answer with the section we read it from, or that we have not read it. Ask a rules question.

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