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Old 08-26-2014, 04:05 PM   #1
 
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Fuel pump diagnostics...

Hi folks...

97 NG900 with B234. Was getting hard starts, odd WOT surging, and "off" throttle feel for a couple of days. CPS is new. DIC is new.

Monday morning on the way to the office car dies on the highway and won't restart. I suspected fuel pump but didn't get a chance to check it until today.

I swapped the under dash relays to see if that was the issue -- started, but shut off after a minute and wouldn't restart.

I'm still suspecting fuel pump, but before I order it -- and cut a hole under the back seat -- is there any other test I'm missing? Anything else that could be causing the symptoms?
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Old 08-26-2014, 06:04 PM   #2
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the good old fuel pump test of smacking the tank while cranking is always my favorite. If it starts you know your fuel pump is going out.
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Old 08-26-2014, 08:39 PM   #3
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^^^ That.
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Old 08-27-2014, 06:49 AM   #4
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The fuel pump does seem like the culprit, but with all of the T5 diag stuff going on on TSL right now I would also check some of your wiring as well.
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Old 08-27-2014, 07:49 AM   #5
 
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Quote:
Originally Posted by mike saunders View Post
Hi folks...

97 NG900 with B234.
So mechanically we drive the same car...

My T5 swap is from 97 SE Auto.... great commute it is....


Sorry,,,

couldnt resist.... .....

I am sure you will work it out....your a smart guy....
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Old 08-27-2014, 09:48 AM   #6
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Fuel pressure gage on the rail will tell you for certain of course. You can verify CPS is working with an injector noid light tester. Once the tank is down (or if you cut an access panel under the rear seat) you can of course check for power and ground at the pump connector, and check the resistance of the pump (it should have continuity across the two terminals, I forget how many ohms tho, but it should be like single or double digit resistance, like 12 ohms or something. If it's like... 500, or open circuit then the pump is bad.
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