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Fuel Pump Inlet Size

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Old Nov 4, 2005 | 04:43 PM
  #1  
Zrated83's Avatar
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From: Buckley AFB, CO / Crestview, FL
Car: 83 Z-28
Engine: LG4
Transmission: 700R4
Axle/Gears: 02 WS6 Rear w/3:42
Fuel Pump Inlet Size

Does anybody know the size of the fitting that goes into the fuel pump? I am converting my fuel line over to a braided one. Summit said it was 3/8 but the 3/8 fitting does not fit, it is too tight and I dont want to force it on. Any help is appreciated.


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Old Nov 5, 2005 | 06:06 AM
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From: Philly, PA
Yeah, it's 3/8" but the metal inlet fitting on the fuel pump has a little "shoulder" on it out near the end. Might be the reason your aftermarket braided hose doesn't want to go on.
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Old Nov 5, 2005 | 09:13 AM
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From: MD
Car: '88 IROC-Z medium orange metallic
Engine: L98
Transmission: 700R4
Axle/Gears: 3.27
You getting rid of the hard line in the picture for AN? Then you need 3/8npt to -6 adapter to thread into the pump. If you're trying to join the hard 3/8 line to AN, then you'll need a tube nut .

Last edited by Dialed_In; Nov 5, 2005 at 09:15 AM.
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Old Nov 5, 2005 | 10:35 AM
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From: Buckley AFB, CO / Crestview, FL
Car: 83 Z-28
Engine: LG4
Transmission: 700R4
Axle/Gears: 02 WS6 Rear w/3:42
Originally posted by Damon
Yeah, it's 3/8" but the metal inlet fitting on the fuel pump has a little "shoulder" on it out near the end. Might be the reason your aftermarket braided hose doesn't want to go on.
What do you suggest I do? I could get the fitting started a little bit by hand but then it became to tight and I didnt want to use a wrench on it yet.

Dialed in- I am replacing the hardline for a braided line. I have a 3/8 npt to -6 an fitting but the fit is tight.

Last edited by Zrated83; Nov 5, 2005 at 10:39 AM.
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Old Nov 5, 2005 | 10:42 AM
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From: MD
Car: '88 IROC-Z medium orange metallic
Engine: L98
Transmission: 700R4
Axle/Gears: 3.27
npt threads are tapered, it will feel tight before it threads all the way in, depending on how it was tapped. Use some teflon thread sealer and tighten it up.
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Old Nov 5, 2005 | 03:05 PM
  #6  
zNucleaRz's Avatar
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From: Newport News, Va
Car: 84 Z28
Engine: GMPP 350 HO
Transmission: 700R4 + Shift Kit
Axle/Gears: Auburn Posi; Richmond 3:73 Gears
Originally posted by Dialed_In
You getting rid of the hard line in the picture for AN? Then you need 3/8npt to -6 adapter to thread into the pump.
This is what I did I have braided lines from the pump to the carb. But I didn’t have any trouble threading the NPT fitting on the pump. Then I put a 90degree elbow on the -6AN side to route it up toward the carb.
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Old Nov 7, 2005 | 11:59 AM
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From: Buckley AFB, CO / Crestview, FL
Car: 83 Z-28
Engine: LG4
Transmission: 700R4
Axle/Gears: 02 WS6 Rear w/3:42
Ok cool. I will go ahead and install the fuel line tommorow when I get some time
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