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Old 04-04-2012, 06:11 PM   #1
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Default Bronco Fuel

I have an 86 Bronco II V6 fuel injected and I was wanting to replace the fuel lines but then I heard that fuel injected cars need to have high pressure fuel lines. Ive never heard of high pressure fuel lines so Im not sure if the guy was making stuff up or if I really need high pressure lines and how much it is and where I can get the stuff.

Thanks Erik
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Old 04-04-2012, 06:24 PM   #2
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The regular stuff will work just fine, it's only 65 pounds as an absolute maximum. you get higher pressures in your household plumbing.
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Old 04-04-2012, 07:29 PM   #3
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Quote:
Originally Posted by martin View Post
The regular stuff will work just fine, it's only 65 pounds as an absolute maximum.
Nix that. You do need FI specific line. You can't use the stuff that you would use on a carbed system. Carbed fuel pressures are about 5 to 15 PSI AFTER the pump. FI systems can produce up to 75 PSI through the whole system.

You don't have to have all hard lines, but I would recommend it if you can find it, but if you go to the parts store there IS a difference between regular fuel lines and injection rated lines. In PA if I see a fuel line that is printed with "Not for FI" on it on an injection system I can fail it for saftey inspection.

Quote:
you get higher pressures in your household plumbing.
The stuff running through your household pipes isn't flamable enough to be used as an automotive fuel.
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Old 04-04-2012, 09:59 PM   #4
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http://www.oldfuelinjection.com/?p=95
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Old 04-05-2012, 03:35 PM   #5
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You are OK with low pressure line from the tank to your high pressure pump. From there, you need and should have high pressure line to the fuel rail. The return doesn't matter, and can be either because it just dumps back into the tank and is not pressurized at all.

I would not run low pressure hose after the pump on the frame for safety reasons, ie IF it ruptures you will have a LOT of fuel spraying everywhere, like on your exhaust, engine, and possibly YOU when you get out of a burning truck.
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Old 04-05-2012, 10:23 PM   #6
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The fuel lines are nylon, so rust is not an issue. I see no reason to replace the lines. I just replaced the tank fuel pump and had damaged connectors from rust on the metal lines coming out of the tank. Dorman makes replacement ends, usually with 18" of attached nylon fuel line and a coupler that requires warming up the nylon to manage to make the splice. Molding the sharp curves in the line is a problem I need to resolve. The pressure line is 3/8" and the return line is 5/16" using hairpin connectors except at the fuel rail where spring locking connectors are used. I couldn't find a fuel filter anywhere on my '86 but have replaced the filter on my '88. My accumulator doesn't want to open up and I'm not going to force it open to look for a filter in there.
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