gas leak

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kwl82
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gas leak

Post by kwl82 » Sat Apr 13, 2019 4:51 pm

So fired up today for first time after brutal midwest winter. Started with no problem but immediately smelled gas and found it leaking heavily from underneath at fuel filter. Shut off car and disconnected battery. Upon inspection it looks like leaking at entrance to filter then running down shield and draining at the bottom. Guessing it is blocked? Filter only 2 years old with maybe 2500 miles.rubber from pump is newish as well. Gonna change filter but is it possible anything else? Not a fan of gas leaks. Thanks in advance
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rridge
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Re: gas leak

Post by rridge » Sat Apr 13, 2019 10:36 pm

Could be that the section of rubber hose is cracked. Fuel line deteriorates from the inside out. If it needs replacement use hose rated for fuel injection, SAE 30R9. While you are at it, shake the water out of the fuel filter. It is the low point in the fuel system and accumulates condensation from the tank.
Richard
'81 Turbo Spider
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davedecker4
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Re: gas leak

Post by davedecker4 » Sun Apr 14, 2019 3:42 am

Replace the filter and that section of hose. It does not have to be FI hose but does need to be good quality carb rated hose in right size. You may want to replace the clamp also. Hard to tell for sure from the pic. Some of those cheap FI style clamps don't work as well in this application.
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kmead
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Re: gas leak

Post by kmead » Sun Apr 14, 2019 8:39 am

The clamp looks maxed out in terms of adjustment, a smaller clamp may be in order.

I would replace the hoses at each, the clamps for a more appropriate size and likely a new filter.

Bummer of a way to start the driving season.
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bartigue
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Re: gas leak

Post by bartigue » Tue Apr 16, 2019 2:57 pm

I agree on the clamp size, it may be as simple as that.

If the filter is already clogged then you have rust in the fuel tank or some other contaminate. Easy enough to find out, disconnect the hose from the filter and dump it into a jar. if the filter is full of rust it will leak out rusty.
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rridge
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Re: gas leak

Post by rridge » Tue Apr 16, 2019 5:11 pm

It does not have to be FI hose but does need to be good quality carb rated hose
Well actually it does have to be fuel injection hose. The fuel filter is downstream of the injection pump and is pressurized by it. That's also why the fit of the clamps is fussy.

These days carb fuel line is likely to be old stock. I wouldn't use it on a lawn mower.
Richard
'81 Turbo Spider
Rockville, MD
kwl82
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Re: gas leak

Post by kwl82 » Wed Apr 17, 2019 10:44 am

Found this Saturday, on Sunday we got nice April snowstorm of 3 inches :roll: So checked again yesterday and looks like might be the clamp. I removed everything and the fuel came out clean from filter. I blew air thru it and sprayed easily with no restriction. Reconnected everything and really cranked on clamp. started again and no leaks. I guess it may have just come lose over time. Going to get smaller clamp tho, just to be sure. Thanks again, just wanted to make sure wasn't overlooking anything.
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davedecker4
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Re: gas leak

Post by davedecker4 » Wed Apr 17, 2019 9:42 pm

Oh, is this an FI car? If so, then yes, anything after the pump needs to be FI hose. Glad you seem to have it figured out.
Let us know if that doesn't cure it.
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rridge
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Re: gas leak

Post by rridge » Thu Apr 18, 2019 12:20 pm

Any rubber or plastic fuel line exposed to gasoline or alcohol shrinks over time. The lower the quality the greater the plasticizer loss and the more the shrinkage. Attached is a picture of two pieces of the same hose. One end has been soaking in gasoline for a month.
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3-8in tube shrinkage.jpg
3-8in tube shrinkage.jpg (81.26 KiB) Viewed 56 times
Richard
'81 Turbo Spider
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