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86 fuel issue

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Old Jan 15, 2010 | 06:25 PM
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Default 86 fuel issue

Hello all..
Thanks ahead of time for your help.

I have an 86 vert, that was running fine. With the recent cold snap in Florida, I let it sit until it got warmer. Yesterday, I went out and wanted to run it around a bit, but it didn't want to start. (It has always fired up with a key turn (with the exception of the VATS issue that I fixed).

Been browsing the forums, and found that my issue is most likley either fuel pump, or fuel sending unit.

Here are my symptoms:
Non start, unless I use starting fluid.
Fuel tank reading full, with about 1/4 tank.

I do not have a gauge at present. I will buy one of needed. (Cash is tight and trying to avoid it unless I need it).


What can I presume without a gauge?
It seems that with the tank reading full, the issue may be the sending unit.
Would a bad fuel pump cause the same issue?
Would the relay cause the same issue?

Thanks for your help...
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Old Jan 15, 2010 | 06:33 PM
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Presume nothing without a gauge. Troubleshoot, don't guess. If you think buying tools is expensive, try throwing parts and time at it trying to fix the problem.

Go to Harbor Freight tools and buy a fuel injection pressure gauge. About $20. Or, you could just go borrow one from Autozone under their tool loan program. Get back to us when you have that.

Troubleshooting = Time and money efficient.
Guessing = Massive waste of time and money.
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Old Jan 15, 2010 | 06:35 PM
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Here you go....

http://www.harborfreight.com/cpi/cta...emnumber=92699
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Old Jan 15, 2010 | 06:44 PM
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can you hear the fuel pump run/prime?

But I agree with FF on the gage. They are cheaper than a fuel pump if you don't need one.

Could be the relay could be a lot of things. Could be that wiring on the fuel pump.
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Old Jan 15, 2010 | 07:25 PM
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Some basic things that can go wrong in your fuel system.

1. Fuel pump / sock
2. Pulsator
3. Obstructed or broken pressure line
4. Filter
5. Injectors, wiring, and ECM
6. Fuel pressure regulator and vacuum line.
7. Obstructed or broken return line
8. Fuel pump wiring and relay / oil pressure switch as secondary path.
9. Collapsed or leaking fuel tank.
10. Shrader valve
11. Sending unit, gauge, and associated wiring.

Not a complete list. A fuel pressure test (under several conditions) is the most basic test we run to determine which components warrant further inspection.

You say it starts with starting fluid. Does it continue to run afterward, or does it die once the fluid is exhausted?
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Old Jan 15, 2010 | 08:03 PM
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Originally Posted by Frizlefrak
You say it starts with starting fluid. Does it continue to run afterward, or does it die once the fluid is exhausted?
It dies...

I will get a pressure gauge, and report back...
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Old Jan 15, 2010 | 08:06 PM
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Have you tested the fuel pump fuse and the 2 injector fuses ?
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