ZR1 quites running after short distance

[alexco]

Looking for some suggestions on my 1990 ZR! which I recently purchased. I bought the car knowing this problem exited. After driving the car 1/4 mile to a mile, the car just stops. Appears to be out of fuel. The previous owner put in a complete new fuel pump assembly to no avail. One thing he did have done was have someone put in a new ignition switch about the same time as the problem started. How and what would the ignition switch do to cause this problem. The switch is inexpensive but would like to understand why this would occur. What other potential areas would cause the same problem. Thanks for any help.
Alexco:flag2:

[Dynomite]

Looking for some suggestions on my 1990 ZR! which I recently purchased. I bought the car knowing this problem exited. After driving the car 1/4 mile to a mile, the car just stops. Appears to be out of fuel. The previous owner put in a complete new fuel pump assembly to no avail. One thing he did have done was have someone put in a new ignition switch about the same time as the problem started. How and what would the ignition switch do to cause this problem. The switch is inexpensive but would like to understand why this would occur. What other potential areas would cause the same problem. Thanks for any help.
Alexco:flag2:


How/when do you get it started again?

[alexco]

It usually has to sit for sometime, but there is occasions after about 5 mins it will start up.

[2ljd]

Fuel filter?


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[GOLDCYLON]

Although you state the fuel pumps were replaced it certainly seems like that is still the problem. Does the car just die? Are the electronics still working it just quits running. Is a security light flashing ?

[XfireZ51]

It usually has to sit for sometime, but there is occasions after about 5 mins it will start up.

And after it starts up, does it stay running or quit again?

[dredgeguy]

Did you replace both fuel pumps, primary and secondary?

[Fully Vetted]

I'd start with testing the pumps (follow the procedures in Solutions. Takes 10 mins) or hooking up a fuel pressure gauge. My guess...filter.

[alexco]

Yes, both pumps, the entire assembly. I just purchased a filter and will replace it today. I have been chasing it as an electrical issue, but I think you guys might be right with the filter. I will find out this weekend. If there was an electrical issue, where would you look? I appreciate everyone's help.
thanks

[alexco]

Once it starts in the garage it will run for a long time, not stopping. Which again could point to the filter, at idle, low fuel flow, driving, higher RPM;s, more fuel. As I said earlier I will know this weekend.
Thanks again.

[5ABI VT]

In the garage are you saying that this is a full cold start? Would take a while for it to warm up to temp before switching loop modes. I cant recall when the fuel pumps switch. That jumper harness Goldyclon is doing a group buy on would be perfect to try in this case to see if its one of the pumps. x2 : are all the dash lights and everything off or is the only symptom being the engine dies?

[alexco]

There are two light on, check engine light and suspension light. They changed shocks on the car so I suspect that is where the suspension light is coming. Yes, it is a cold start and only idling in the garage at the moment. Bought a pressure tester. Will test in the morning and tehn change the filter. thanks.

[Marc Haibeck]

Both fuel pumps run until the engine warms to 176 degrees. Then the secondary pump is turned off. If the primary pump is not working the fuel pressure will go to zero. Check the fuel pump one (FP1) fuse.

Test the primary pump. Remove the rubber filler around the fuel cap. Disconnect the four wire electrical connector. With a 10 amp fused power source apply 12 volts between the black and the grey wires. In a quiet area you will hear the pump run if it is good. The green wire is for the secondary pump. The purple wire is for the fuel level sensor. Applying 12 volts to the purple wire will destroy the sensor.

[Mystic ZR-1]

In the garage are you saying that this is a full cold start? Would take a while for it to warm up to temp before switching loop modes. I cant recall when the fuel pumps switch. That jumper harness Goldyclon is doing a group buy on would be perfect to try in this case to see if its one of the pumps. x2 : are all the dash lights and everything off or is the only symptom being the engine dies?

Fuel pump jumper worked for me to trouble shoot my
fuel pump problem 😀
Primary pump was on it's way out...

[BigJohn]

Fuel pump jumper worked for me to trouble shoot my
fuel pump problem 😀
Primary pump was on it's way out...

Yeah, they do that!

[Z51JEFF]

In the garage are you saying that this is a full cold start? Would take a while for it to warm up to temp before switching loop modes. I cant recall when the fuel pumps switch. That jumper harness Goldyclon is doing a group buy on would be perfect to try in this case to see if its one of the pumps. x2 : are all the dash lights and everything off or is the only symptom being the engine dies?

OP, I made a jumper and I'm in Fremont if you want to come get it to try.

[alexco]

Marc, you were dead nuts on. Primary pump not working. I don't kow who installed the new pump assembly for the guy but after they did it they should have checked the fuse. It was blown. Replaced and off we go.

Now a second question, exhaust leak, thought it was exhaust system but find out it is missing about for bolts in the exhaust manifold. Idea of where I can get the spacers for the bolts. I could make them, easy enough, but if the proper ones are available, I would go for them.
thanks
Alexco:salute:

[Marc Haibeck]

It's nice to see that you fixed the fuel problem easily.

On the '90 to '92 engines the factory installed only six bolts along with the center stud. Normally that's all that's needed. Two clamping points per port. If you want to install additional bolts Jerry has them. I don't know of a source for the loading spacers.

[Paul Workman]

I have the spacers i took off my 90 when I installed the SW headers. If anyone wants them, you're welcome to them. PM me with your address and I'll gift them to ya!

[A26B]

Now a second question, exhaust leak, thought it was exhaust system but find out it is missing about for bolts in the exhaust manifold. Idea of where I can get the spacers for the bolts. I could make them, easy enough, but if the proper ones are available, I would go for them.
thanks
Alexco


Some reference information pertaining to this subject.

http://www.jerrysgaskets.com/bolt-exhaust-manifold-90-95-1d2/

[alexco]

marc, I checked and there are 6 bolts plus the center stud so it is not the manifold to the heads, which means it is most likely the manifold itself, cracked somewhere. I hear that is a problem with these manifolds but I can see the crack, where do they usually crack? thanks.