aartod

I have a fuel pump issue and I was wondering if anyone has had a problem like this before or knows anything about it. The car has a 86 4.3l tbi v6 and has a in-tank fuel pump. It wasent starting so when I was checking for fuel I disconnected the fuel line at the throttle body and cranked over the car and fuel spurted out for about a second or two then it stopped flowing alltogether... so I tried it again and the same thing happened over and over. So then i checked to see if there was power getting to the fuel pump all the time not just during the intial start-up--- and there was... I unplugged the connector by the tank and put a test light on it and there was constant power while cranking. So if there is power getting there and the pump is not pumping enough then I figure it needs to be replaced... But I have never see this before, I have seen them not work at all, or not enough pressure, but not a big spurt and then nothing- everytime! What do you think?

Scrapper

it sounds like you do need a fuel pump but i'd put it on a guage and see how many psi it's at and see how much psi it's supposed to have since it's a tbi.

aartod

I dont have a gauge... It think the older tbi system only used about 10-12 psi..

Airjer_

I would backprobe the grey power wire with the connector plugged in. Make sure there is 12 volts there all the time with a voltmeter. If voltage drops there is another issue!

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MT-2500

You need a gauge to test pressure.
Can not tell by the squirt how much pressure it has.
Parts places and tool dealers have gauges for sale and some parts places loan/rent gauges.

Check that pressure and post back pressure readings.

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Remember proper testing gives us the answer to many problems.
MT

aartod

Well after the intial spurt of gas there is no gas flowing out of the fuel line I dont think I need a gauge to measure 0 psi...

rhandwor

Run a temporary set of wires back to the fuel pump this will eliminate a wiring problem otherwise buy a new pump.
A loose fuel pump ground will cause many fuel pump problems.