Not permitted, not listed in the rules 16 classes
On a closed list an unlisted modification is not permitted. · A.2.2, J.1
IHRA · Fuel
High-pressure fuel line and fittings
IHRA answers this part for 29 of its classes. 10 of those answers are permissions, with or without limits attached, and 19 are not. 19 are inferred from how the class is written rather than quoted from a rule naming this part.
Where it stands, class by class
29 classes, grouped by the answer rather than listed one by one, because an answer that holds for a class usually holds for every class that borrows its rules.
Not permitted, not listed in the rules Our reading, not a rule we can quote at you. This class requires the craft to stay stock except where the rules allow otherwise, and this part is not on the list.
No rule, this is an open class Our reading, not a rule we can quote at you. This class carries no stock clause at all, so anything unlisted appears to be open. The rulebook does not say so in terms.
Legal, within limits 2 classes
Fuel pressure regulators and upgraded fuel lines are permitted, alongside the single in-tank electric pump.
- Drag, Yamaha Pro Stock · DD.1
- Drag, Sea-Doo Pro Stock · DD.2
Legal, within limits 1 class
Replacement lines may not provide any function beyond OE hoses. · W.3.1
Legal, within limits 1 class
Fuel pressure regulators and upgraded fuel lines are permitted, with the pump itself inside the tank. · DD.3
Legal, within limits 1 class
Fuel pressure regulators and upgraded fuel lines are permitted, and any type of pump. · DD.4
Legal, within limits 1 class
SAE J30R9 high-pressure hose. Metal filters on high-pressure lines. Threaded fittings or crimped clamps only. NYLON TIE WRAPS AND STANDARD SCREW CLAMPS NOT ALLOWED on high-pressure lines. · CC.3.2
Legal, within limits 1 class
High-pressure lines must meet SAE J30R9. Metal filters only on the high-pressure side. · K.4.2
Legal, within limits 1 class
SAE J30R9 on high-pressure. A.N. threaded or equivalent fittings with non-removable crimped clamps. Hose clamps and tie wraps NOT allowed. Metal filters only on high-pressure. · V.3.1
Legal, within limits 1 class
SAE J30R9 required. Metal filters on the high-pressure side. · X.3.5
Legal 1 class
Corrected 2026-09-21: J.7 names spark plugs, wiring, hoses and clamps as replaceable with aftermarket options outright, which overrides the closed-list default. This duplicates what the spark-plugs row already states correctly for this class under J.7; the two rows should be reconciled. · J.7
No rule, this is an open class 3 classes
The class states only what it bans and calls itself run what you brung, against a section DD preamble that says anything unlisted is illegal.
- Drag, 2 Stroke Unlimited · DD.12
- Drag, Stand Up Unlimited · DD.10
- Drag, Unlimited · DD.6
High-pressure fuel line and fittings: 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.
Every IHRA class · where the rulebooks differ · signed checks on parts the shop sells.
Fuel · two and four stroke · legal outright in 10 of 29