I replaced my rubber fuel lines - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**MikeB** · 01-27-2026, 03:43 PM

Did you notice the rating on your old and new hoses?

Here's the lowdown on types of fuel hose:

SAE 30R6 and 30R7 Hoses
These hoses were the industry standards for decades. SAE 30R6 and 30R7 hoses were designed for fuel systems rated at 50 PSI or less of working pressure like carburetors and TBI fuel injection. The hoses have a nitrile rubber inner liner reinforced with single-ply braided cord and a neoprene rubber cover. SAE 30R6 and 30R7 hose is not compatible with ethanol and many modern additives designed to boost gasoline octane.

SAE 30R9 Fuel Injection Hose
As the name implies, SAE 30R9 hose is designed for use with EFI systems that use hose clamps and have working pressures of 100 PSI and up. It features a fluoroelastomer inner liner that can handle all types of fuel including oxidized gasoline, diesel, methanol, and ethanol-blend fuels. SAE 30R9 hose also resists fuel permeation so it’s emissions-legal.

Replacing old fuel hose with SAE 30R9 fuel injection hose is the smart play. The small price difference compared to SAE 30R6 or 30R7 nitrile hose is well worth it.

01-27-2026, 03:43 PM	#5
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 4,035	Re: I replaced my rubber fuel lines Did you notice the rating on your old and new hoses? Here's the lowdown on types of fuel hose: SAE 30R6 and 30R7 Hoses These hoses were the industry standards for decades. SAE 30R6 and 30R7 hoses were designed for fuel systems rated at 50 PSI or less of working pressure like carburetors and TBI fuel injection. The hoses have a nitrile rubber inner liner reinforced with single-ply braided cord and a neoprene rubber cover. SAE 30R6 and 30R7 hose is not compatible with ethanol and many modern additives designed to boost gasoline octane. SAE 30R9 Fuel Injection Hose As the name implies, SAE 30R9 hose is designed for use with EFI systems that use hose clamps and have working pressures of 100 PSI and up. It features a fluoroelastomer inner liner that can handle all types of fuel including oxidized gasoline, diesel, methanol, and ethanol-blend fuels. SAE 30R9 hose also resists fuel permeation so it’s emissions-legal. Replacing old fuel hose with SAE 30R9 fuel injection hose is the smart play. The small price difference compared to SAE 30R6 or 30R7 nitrile hose is well worth it. __________________ Mike 1969 Custom/10 LWB -- owned for 37 years. 350/TH350, 3.08 posi, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. Hedman stainless headers. Old Air installation in progress. 1982 Custom Deluxe 10 SWB -- converted from 250-six to roller cam 350 w/ Vortec heads -- sold 1981 C10 Silverado LWB, 305, TH350C -- sold, but wish I still had it! 1969 C10 (not the current one) which I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 26 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!



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