[QUOTE]Originally posted by Patrick:

I had to put this project on the back-burner as I had an '88 Formula that I wanted to tweak for autocross this year. That Fiero is basically done for now (performs great at autocross), so I returned to the Mighty Duke today.

To bring us up to speed from when this was put on hold...


I dropped the tank today. What I found was very interesting. Keep in mind this was a car that I bought non-running and which ended up sitting for eight years before I swapped in a 5-spd and did a hundred other things... but I had never dropped the tank. I was rather curious what I was going to find.

Here's the short chunk of flexible hose that I suspected was going to be rotted. It isn't.



Did you find those keys in the tank?

quote Originally posted by Dennis LaGrua: I would bite the bullet and go for the SAE 30R10 submersible fuel line...

Oh, I fully intend to. I've been researching purchasing options, as reported Here.

quote Originally posted by steve308: Did you find those keys in the tank?

No, I found them in my pocket. I just included those keys in the shot to give some perspective to the size of the hose.

quote Originally posted by Patrick: I have a 4" length of fuel hose here that came with a relatively expensive high performance aftermarket fuel pump for my Subaru Impreza WRX STi, but it has no identification markings on it whatsoever... so I haven't used it, and don't expect ever to.

Out of curiosity, I cut this short length of hose in half and dropped one piece of it into a jerrrycan of gasoline. After letting it soak for a couple of weeks, I removed this piece of hose from the jerrycan and inspected it for any signs of swelling.

Here's a picture of it compared to the non-soaked piece of hose. The swelling is very slight (hey, it's only been two weeks!), but the outside of the hose definitely feels different. Difficult to explain, but the outer layer feels thinner, more fragile. I fully expect this hose would fail if used as submersible fuel line... even though it was supplied with a new in-tank submerged fuel pump.

[This message has been edited by Patrick (edited 08-01-2020).]

I purchased a piece of submersible fuel line a while back. I haven’t had any fuel pressure issues in my ‘84 but am wondering if I should be proactive and replace it at the end of the driving season...

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1984 Indy Fiero

Also what works to help quantify the chemical attack is the measure the weight of the sample before/after the dunk in a solvent.

A weight gain could indicate:
the sample absorbed some solvent

A weight loss could indicate:
the sample lost weight because some of it dissolved into the solvent

No change:
doesn't mean much!

[This message has been edited by pmbrunelle (edited 08-02-2020).]

quote Originally posted by ag9123: I purchased a piece of submersible fuel line a while back. I haven’t had any fuel pressure issues in my ‘84 but am wondering if I should be proactive and replace it at the end of the driving season...

Do you know what's on there now? Is there a reason why you're suspicious of its integrity?

quote Originally posted by Patrick: You think there's that much chance that it's the fuel filter, eh? I'm feeling a bit better about this now.

my 6.0 silverado starts chugging at about 55 but never before no matter how much gas i give it because those smaller gears have a lot more torque but while going at 55 under 2k rpm theres little torque and a lot of load. no idea what it will end up being i went to replace fuel filter and it was all so rusted i broke the ling and gas started leaking. now the truck is at the road for 5 grand lol.