Question about 1994 Chevrolet Suburban

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Fuel pump I was wondering can a fuel pump betested by measuring th return rate gpm?

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I've never heard of it being tested that way. It's tested by checking pressure on the fuel line near the injector's fuel rail. If you're in the Denver Colorado area, bring it by and I'll check it for you. Otherwise, your local autozone should check it for you for free as well.

Posted on Jun 02, 2009

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The performance of an electric fuel pump can be tested several ways. The easiest and most effective of which is to test fuel pressure and volume at the vehicles fuel pressure test port. Normally located on the fuel injection rail. A more direct method would be breaking the fuel line somewhere between the pump and the fuel filter and placing your gage there for a test.

Posted on Jun 02, 2009


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You did the parts replacement yourself?

If so, all your saying, is you think or suspect
something & started changing parts

No part is ever replaced, until all testing necessary
is complete

In order to do any testing, you have to understand
the product & usually need reference material,service
or diagnostic manuals to follow charts or wiring daigrams

A fuel filter is replaced based on time, measured in years
& also mileage. So that was a no brainer.If it isn't 3 or 4
years old,it isn't the problem

With the TPS, you need to know how old it is & it has to be
tested,period,to know if it works,& that may require an
oscilloscope,not just a volt meter.

Have you had it checked for codes at all?
That is where you always start.

Given the age, 1987, what about a worn timing chain
or a worn out fuel pump. You checked fuel pressure?

What about the Idle Air Control Solenoid?

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