morning sickness
Thread Starter
Heel & Toe
Joined: Apr 2008
Posts: 24
Likes: 1
morning sickness
Hi, I'm a new member, I find this forum has lots of information and great help from forum members. Here is my problem with my vette, I own 89 convertible for over 10 years with 80.000 mile , I do all the repair on this vette,as well all my cars,none of my car step into a auto shop, i just don't trust any mechanic working on any my car,except States inspection is no way avoid. The problem is, only happen in morning or 1st time after the car sit for a days or two, its take about 15 second or longer cranking before the car start up, and thru-out the day the car start up fine. I check fuel pump,MAF,IAC and all come up as per spec. Its drive me crazy on this, is anyone who has this problem, any advise from members? Thanks. Keith
Last edited by electinspector; Jun 8, 2008 at 06:20 PM.
Race Director
Joined: Aug 2000
Posts: 14,130
Likes: 7
Cruise-In II Veteran
After the car sits a day or 2,hook up the pressure gauge and see what it says when you turn the key to ON.Dont start it,just turn the key to ON.You should see around 42 psi on the gauge.If it doesnt go up that high,turn the key to OFF,wait a few,then turn it back on.What does it say?
Long cranking times are usually not enough fuel if the engine has spark and cranks over and over.
Sometimes a dirty fuel filter can cause the problem.Change that too.
Sometimes,leaking fuel injectors can cause the problem,but since you said it restarts well,and only happens when it sits a while,im guessing the pump or fuel line filter has a bit of restriction.It sounds like not enough gas getting to the rail when its bled down.A faulty check valve in the pump can cause this too.
Start there and let us know what you found.
Hope this helps some.
Long cranking times are usually not enough fuel if the engine has spark and cranks over and over.
Sometimes a dirty fuel filter can cause the problem.Change that too.
Sometimes,leaking fuel injectors can cause the problem,but since you said it restarts well,and only happens when it sits a while,im guessing the pump or fuel line filter has a bit of restriction.It sounds like not enough gas getting to the rail when its bled down.A faulty check valve in the pump can cause this too.
Start there and let us know what you found.
Hope this helps some.
Thread Starter
Heel & Toe
Joined: Apr 2008
Posts: 24
Likes: 1
After the car sits a day or 2,hook up the pressure gauge and see what it says when you turn the key to ON.Dont start it,just turn the key to ON.You should see around 42 psi on the gauge.If it doesnt go up that high,turn the key to OFF,wait a few,then turn it back on.What does it say?
Long cranking times are usually not enough fuel if the engine has spark and cranks over and over.
Sometimes a dirty fuel filter can cause the problem.Change that too.
Sometimes,leaking fuel injectors can cause the problem,but since you said it restarts well,and only happens when it sits a while,im guessing the pump or fuel line filter has a bit of restriction.It sounds like not enough gas getting to the rail when its bled down.A faulty check valve in the pump can cause this too.
Start there and let us know what you found.
Hope this helps some.
Long cranking times are usually not enough fuel if the engine has spark and cranks over and over.
Sometimes a dirty fuel filter can cause the problem.Change that too.
Sometimes,leaking fuel injectors can cause the problem,but since you said it restarts well,and only happens when it sits a while,im guessing the pump or fuel line filter has a bit of restriction.It sounds like not enough gas getting to the rail when its bled down.A faulty check valve in the pump can cause this too.
Start there and let us know what you found.
Hope this helps some.
Drifting
Joined: Oct 2006
Posts: 1,934
Likes: 3
From: Citrus Heights California
The first thing I would do is change the fuel filter. It could be clogged. It's cheap and easy to eliminate the filter. Then start checking other things.
My guess is the fuel pump is going. To me it sounds like your fuel is slowly draining back into your tank. The pump may not be working right and keeping up an even supply of gas.
If you have a leaky injector you could have a problem with cranking. The gas leaks into the engine flooding it and making it hard to start.
To check for a leaky injector hold the gas peddle to the floor when its cranking. If that helps then you may have a leaky injector.
I don't think the fuel pressure regulator is the problem. You could get a new diaphragm rebuild kit for under $50.00. It takes about 20 minutes to rebuild a fuel pressure regulator.
Your fuel pump is in your tank. It should take about 1 hour to replace. It's not difficult. Just be careful working around gas.
My guess is the fuel pump is going. To me it sounds like your fuel is slowly draining back into your tank. The pump may not be working right and keeping up an even supply of gas.
If you have a leaky injector you could have a problem with cranking. The gas leaks into the engine flooding it and making it hard to start.
To check for a leaky injector hold the gas peddle to the floor when its cranking. If that helps then you may have a leaky injector.
I don't think the fuel pressure regulator is the problem. You could get a new diaphragm rebuild kit for under $50.00. It takes about 20 minutes to rebuild a fuel pressure regulator.
Your fuel pump is in your tank. It should take about 1 hour to replace. It's not difficult. Just be careful working around gas.
Last edited by Kool88vette; Jun 10, 2008 at 12:00 PM.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
If you open the gas door you can remove the rubber boot to access the FP assembly. Also you can clamp the tubber hoses going off the the right side to see if that stops the fast bleed down of FP.
-if clamped pressure line stops bleed down, replace the pump
-if clamped return line stops bleed down, replace the regulator diaphram
-if neither stops bleed down, service the injectors
Once you have the rubber boot removed you will see the ring of screws holding the pump assembly to the top of the tank. Unplug the electrical connector, remove the two fuel lines and the one vent line, remove the ring of screws and carefully lift the assembly from the tank.
-if clamped pressure line stops bleed down, replace the pump
-if clamped return line stops bleed down, replace the regulator diaphram
-if neither stops bleed down, service the injectors
Once you have the rubber boot removed you will see the ring of screws holding the pump assembly to the top of the tank. Unplug the electrical connector, remove the two fuel lines and the one vent line, remove the ring of screws and carefully lift the assembly from the tank.
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Thread Starter
Heel & Toe
Joined: Apr 2008
Posts: 24
Likes: 1
If you open the gas door you can remove the rubber boot to access the FP assembly. Also you can clamp the tubber hoses going off the the right side to see if that stops the fast bleed down of FP.
-if clamped pressure line stops bleed down, replace the pump
-if clamped return line stops bleed down, replace the regulator diaphram
-if neither stops bleed down, service the injectors
Once you have the rubber boot removed you will see the ring of screws holding the pump assembly to the top of the tank. Unplug the electrical connector, remove the two fuel lines and the one vent line, remove the ring of screws and carefully lift the assembly from the tank.
-if clamped pressure line stops bleed down, replace the pump
-if clamped return line stops bleed down, replace the regulator diaphram
-if neither stops bleed down, service the injectors
Once you have the rubber boot removed you will see the ring of screws holding the pump assembly to the top of the tank. Unplug the electrical connector, remove the two fuel lines and the one vent line, remove the ring of screws and carefully lift the assembly from the tank.
I look through the forums and all agree recetronix.com has excell fuel pump with good price, they has two mod- Walbro 190L/Hr and 255L/Hr,is the small one good enough or I need the large one? the engine is stock, which one you recomm ? Keith
