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Fuel pump tests good, but still no gas?

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Old 12-19-2005 | 05:03 PM
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88fbird's Avatar
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From: Savannah G.A.
Car: 84 S-10:(
Fuel pump tests good, but still no gas?

I'm not getting any fuel pressure on my fuel rail. The pump tests good when I put 12v to terminal G. But doesn't work on its own. Any ideas? I checked for loose connections, but didn't see any.
Old 12-19-2005 | 05:39 PM
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From: San Antonio TX
Car: 1990 G92 IROC Z Miniram
Engine: 388cu 6.4 Liters
Transmission: G-Force T5
Axle/Gears: 3.73 Gears
Try the fuse, fuel pump relay, fuel regulator, fuel filter.
Old 12-19-2005 | 06:03 PM
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From: Savannah G.A.
Car: 84 S-10:(
The fuse is good. I changed one of the relays, I thought it was the fuel pump, but could be wrong. The fuel regulator is an afpr, and has been on the fuel rail for a while with no problems, when I test the pump it pumps pressure to the rail. I haven't touched the filter yet though.
Old 12-19-2005 | 07:14 PM
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ml258-89iroc's Avatar
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From: Kenmore NY
Car: 1989 iroc
Engine: 350
Transmission: 700r4
Axle/Gears: 2.77
I know this isn't a thirdgen fix, but on my honda I had the same problem and it turned out to be my computer.
Old 12-19-2005 | 09:37 PM
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If the pump develops pressure with the 'G' terminal powered from an external source, the filter is not a problem. Check the pump relay and wiring.

To identify the relay, trace the wire colors:
Attached Thumbnails Fuel pump tests good, but still no gas?-fuelpumppower.jpg  
Old 12-20-2005 | 07:02 PM
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From: Savannah G.A.
Car: 84 S-10:(
Well, The relay didn't help. Now the pump won't test. So, I guess I'll be dropping the tank soon.
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