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Old 01-27-2013, 07:13 PM   #16
87vette81big
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Quote:
Originally Posted by oifcombatvet View Post
It instantly stops when the pump stops. I have had some family in town so I haven't had an opportunity to start working on it again. I'm just trying to figure out where to start.

I replaced the fuel pump, strainer/sock, fuel pump relay and fuel filter just awhile back.
I would start with further testing at the fuel pump with the gas door removed & rubber rain boot removed.
Takes less than 5 minutes to access.
Tools you need are a DVM. #15 Torx driver. Vise grip needle nose pliers to pinch off the rubber section of fuel line.
Working Fuel pressure gauge.
1 hour or less time left alone to troubleshoot your 1989 Corvette.
Be sure to click on & read ALL of Grumpy's links above.
He has compiled the very best troubleshooting self help links anywhere.
Its more than just educational.
Just click on them & read.
Go to work when you can escape the family, wife & kids.

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Old 01-27-2013, 08:51 PM   #17
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I have been reading Grumpy's links and I want to make sure I understand this correctly:



Is this the order it all happens then? Fuel supply to pump to filter to rails into injectors into fuel pressure regulator then back into the return line??

If so, I feel that it would have to be the pump or fuel filter if I have zero pressure at the rail. The fuel barely bubbles up and out of the Schrader valve when I press it.

Last time I had no fuel pressure, there was a clicking noise when I turned the key and it ended up being the fuel pump relay.

Granted, the hissing/sucking/sshhhshhh noise when the fuel pump turns on for 2 seconds when turning the key is a new sound.
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Old 01-28-2013, 04:38 AM   #18
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That is true.
Also, if there is a malfunction in the fuel pressure regulator, all gasoline will be sent back the gasoline tank. Makes for Zero fuel pressure also.
The clue is the very loud hissing sound you hear aftet cranking the engine and it fails to start.
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Old 01-28-2013, 06:26 AM   #19
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Quote:
Originally Posted by oifcombatvet View Post
I have been reading Grumpy's links and I want to make sure I understand this correctly:



Is this the order it all happens then? Fuel supply to pump to filter to rails into injectors into fuel pressure regulator then back into the return line??

If so, I feel that it would have to be the pump or fuel filter if I have zero pressure at the rail. The fuel barely bubbles up and out of the Schrader valve when I press it.

Last time I had no fuel pressure, there was a clicking noise when I turned the key and it ended up being the fuel pump relay.

Granted, the hissing/sucking/sshhhshhh noise when the fuel pump turns on for 2 seconds when turning the key is a new sound.
87vette81big, is correct and the diagrams correct chances are excellent that the fuel pressure regulators defective, plug the return line, if the pressure at the fuel rail jumps up and holds the fuel pressure regulators defective, if it doesn,t the pump is not pressurizing the line , the links and sub links have more related testing info.
If you were local we could test and isolate the defective component in minutes
be aware that the oil pressure sensor at the base of the distributor will turn off the fuel pump is at least 5 psi of oil pressure is not seen at the sensor in about 3 seconds of the engine spinning, so verify the connection to the sensors on correctly, and verify the other sensors and vacuum lines are connected



http://members.shaw.ca/corvette86/Fu...mDiagnosis.pdf

http://forum.grumpysperformance.com/...hp?f=32&t=1401

http://forum.grumpysperformance.com/...+sequence#p404

READ THE LINKS AND SUB LINKS
(yes I know you would rather be skinned alive and boiled in oil) (force yourself you might learn a few new things)
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" IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"
Old 01-29-2013, 09:38 AM   #20
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I clamped off the return line and fuel pressure did not build.
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Old 01-29-2013, 10:13 AM   #21
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If I crank it multiple times, turn the key a few times and let the fuel pump run a few times, I can get some more pressure. Granted, I don't have a gauge yet, but when you press the Schrader Valve fuel probably squirts up 2-3 inches.
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Old 01-29-2013, 12:47 PM   #22
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*Update*

I returned the pump as a defect and got a new one. Installed new pump and strainer and turned the key so the pump could run probably 4 times, followed by a few times cranking it to see if it would start.

It will not start. BUT, I do have more fuel pressure than before. Not a whole lot, not spraying out of the Schrader Valve like it should.
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Old 01-29-2013, 04:06 PM   #23
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You need to check the pressure with a guage. Checking by pressing the scheader valve is like checking tire pressure by kicking the tire . Without the checks that grumpy and others have suggested you are just shooting in the dark. Throwing parts at it will not fix the problem and we can not help without the correct info provided from the tests and checks needed. Not trying to be an ass or anything but they have "been there done that" many times with many people and know what they are doing and have given reasons as to why. Think about it - would you go to a doctor that wants to keep doing surgery after surgery until the symtoms go away or one that will run tests and know what the problem is before surgery?
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Old 01-29-2013, 06:13 PM   #24
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Ummmm.

OK.

Parts changing is Ok if you are today's Autozone based mechanic that got a job in GM Dealership because the recession of 2007-to present phased out the "old timers" forcing them to retire early with no pension.

But You have Grumpy here on Digital Corvette.
Ex engineer.
One hell of a mechanic too.
His Forum Rocks too.
I am on there & read often.

I am here too along with others.
The fuel pressure regulator failed on my 87 Vert back in 2008.
Diaphragm stuck open. Like I suspect with your 89 Vette.

I have changed out at least 100 Fuel pressure regulators on GM cars & trucks over the last 20 years. In GM dealerships & small shops. They do fail sometimes.

Go back & read, troubleshoot correct.
He is how the old time Mechanics taught me.
VERIFY THE PROBLEM.
ISOLATE THE PROBLEM.
DIAGNOSE CORRECT.
REPAIR THE PROBLEM.
RECHECK YOUR WORK. DOES IT MEET YOUR OWN CRITERIA FOR PROPER REPAIRS MADE?
HOW ABOUT THE CUSTOMER'S(YOUR WIFE ALSO).?

br
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Old 01-31-2013, 05:19 AM   #25
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after looking in your engine compartment I think we located the source of that HISSING NOISE
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Old 01-31-2013, 06:14 AM   #26
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Quote:
Originally Posted by grumpyvette View Post

after looking in your engine compartment I think we located the source of that HISSING NOISE
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Old 01-31-2013, 03:27 PM   #27
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Originally Posted by grumpyvette View Post

after looking in your engine compartment I think we located the source of that HISSING NOISE
Now thats funny. Might be the cause of overheating also, not to mention the odd smell when warm.
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