Georgia Fiero Club Forum
All Things Fiero => Expert Tech Advice => Topic started by: Fierofool on June 07, 2009, 01:33:17 pm
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This tip comes from PFF member Dennis LaGrua, with his permission to copy. I thought it'd be worthwhile to pass on.
"Many of you that have stock engines or have swapped engines have replaced your fuel pumps with new ones or larger volume/capacity units. You disconnected the electrical line, drained the tank, disconnected the hoses removed the brackets and dropped the tank. Its not a big deal to do this but here is something that only skilled mechanics and the pros know about.
When replacing the fuel pump you can choose to use a "pulsator" to join the pump outout nipple to the fuel line. Trouble is that these things leak like crazy, do little good and you can easily lose pressure, especially when using a high pressure or larger capacity pump. As a result many mechanics use a length of 5/16" fuel injection hose and two hose clamps to couple the pump to the fuel line. Trouble is that much of the time standard high pressure fuel injection hose made to SAE spec J30R9 is used. Many don't realize that SAE J30R9 hose is great for high pressures and it will contain gasoline just fine. However , it will deteriorate, fail and burst in short order if it is submerged in gasoline. It was designed to stand up with gas on the inside not on the outside.
The trick is to use SAE spec J30R10 submersible fuel line for this critical tank connection. SAE spec J30R10 will last when submerged in gasoline, alcohol and other types of fuel without a problem while std J30R9 hose will not.
I have found that most auto supply stores do not carrry this hose and few countermen don't even know about it but we find it available at the NAPA store. Its sold in 1 ft. sections so you don't have to buy a large amount."
Dennis Lagrua
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Some have had problems locating the above listed ethanol submersible fuel hose. I have found that NAPA has the hose. They've apparently changed the part numbers when the product was upgraded. Runs about $40 for a one foot length.
The part number for 5/16 ID (0.3125" ID) submersible fuel injection hose is NBH H209. If you need 3/8 ID, the part number is NBH H213
Submersible Fuel Line Hose is capable of handling multiple types of gasoline and fuels, including gasoline, alcohol-extended gasoline, ethanols, biodiesel or diesel fuel in fully-immersed, mobile and stationary applications. Most fuel lines are only designed to handle fuel on the interior of the hose, which can be damaged if the exterior is exposed to fuel. Engineered for fully submersible use, these hoses are excellent for use on gas tank fuel pumps.
Comprised of an FKM tube and cover with synthetic fiber reinforcement
Exceeds required SAE 30R10 standard
Temperature Range: -40 Deg. F to +302 Deg. F (-40 Deg. C to +150 Deg. C)