testing the ALCL. poor cold start running - Page 3 - ZR-1 Net Registry Forums

Schrade · 05-18-2014

Do you have air in the line?

What's your static pressure? Does it drop off quickly after priming?

Franke · 05-18-2014

Quote:

Originally Posted by Karl

I just finished changing the fuel filter and the car now holds 22psi at idle.

Time to pull the fuel pumps.....

Karl, do you have another fuel pump tester? Just to verify the first one is reading correctly before you replace the pumps. 22 PSI is really low.

Karl · 05-18-2014

I put the pressure gauge on my Malibu and it held 30psi.

Also the gauge will hold 23psi with the ignition on and turned off after the car has started.

I replaced the clamps with metal ones, all 6, and ignition on it jumps to 23psi, and the same when starting the car/idle. It holds pressure when I turn off the car.

I am pretty sure its the pumps. They are old and just before all this I rode around on reserve twice waiting to get gas since I was going to Indiana (i'm about 5 miles from the border, maybe less).

Do the suburban pumps drop in without any issues?

XfireZ51 · 05-19-2014

Quote:

Originally Posted by XfireZ51

Just don't have the rubber squeeze through like dough.

Quote:

Originally Posted by Karl

I put the pressure gauge on my Malibu and it held 30psi.

Also the gauge will hold 23psi with the ignition on and turned off after the car has started.

I replaced the clamps with metal ones, all 6, and ignition on it jumps to 23psi, and the same when starting the car/idle. It holds pressure when I turn off the car.

I am pretty sure its the pumps. They are old and just before all this I rode around on reserve twice waiting to get gas since I was going to Indiana (i'm about 5 miles from the border, maybe less).

Do the suburban pumps drop in without any issues?

Yes.

Karl · 05-19-2014

One last questions, are the strainers for this car available? If so anyone know the part number or an equal replacement part and or number?

Is it necessary to replace the strainers? I never have and I have changed plenty of fuel pumps.

Thanks!

XfireZ51 · 05-19-2014

Quote:

Originally Posted by Karl

One last questions, are the strainers for this car available? If so anyone know the part number or an equal replacement part and or number?

Is it necessary to replace the strainers? I never have and I have changed plenty of fuel pumps.

Thanks!

For me, I would always change them out. Over time, they start to plug up making the pumps work harder. You can sometimes see this with filters collapsing in the middle.

Karl · 05-23-2014

New fuel pumps arrived last night and will be going in tomorrow!

Schrade · 05-23-2014

Did you ever do a static pressure test?

If you have leaking injectors, new pumps won't make any difference.

Getting a new bike pump won't patch a hole in the tire...

I think you should do static pressure, and then chart leakdown time.

Karl · 05-23-2014

Static pressure test?

With the ignition key on and the car not running the fuel pressure guage will hold 23psi and not move.

Is this what you are referring to?

I posted other test results in this thread too.

Karl · 05-25-2014

New fuel pumps and strainers are in and i'm back on the road. No more bog in second gear either.

:-)

05-18-2014	#21
Schrade Join Date: Dec 2012 Location: NC Posts: 1,786	Re: testing the ALCL. poor cold start running Do you have air in the line? What's your static pressure? Does it drop off quickly after priming? __________________ I'm getting my snappics / threads removed blindly as fast as I can, to get in compliance with copyright / license TOS on the boards here (lots of FSM pages and other copyright / license violations on my part; sorry guys). And thanks to all the guys who didn't whine when I posted those FSM copyrighted / licensed stuff in my threads... ( :thumbsup: [b]and to think I complied with a mod's request to delete a pic of him in a Challenge Car in NCM Museum, so he wouldn't get in hot water)[/b] Thanks to several guys here for sending parts FREE; BearlyFlying, WeGone, Geezer, GoldCylon, and more there, TonyD, mike100, fletchusmc... 1990 #2794; 4L60e Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless, Power Effects 3" [IMG]https://lh5.googleusercontent.com/-GHpfzty7DVU/UQn-0Ru2xAI/AAAAAAAAA14/08mz1p4QLD4/s445/Screenshot-5.png[/IMG]

05-18-2014	#23
Karl Join Date: May 2013 Location: Chicago Posts: 980	Re: testing the ALCL. poor cold start running I put the pressure gauge on my Malibu and it held 30psi. Also the gauge will hold 23psi with the ignition on and turned off after the car has started. I replaced the clamps with metal ones, all 6, and ignition on it jumps to 23psi, and the same when starting the car/idle. It holds pressure when I turn off the car. I am pretty sure its the pumps. They are old and just before all this I rode around on reserve twice waiting to get gas since I was going to Indiana (i'm about 5 miles from the border, maybe less). Do the suburban pumps drop in without any issues? __________________ 1993 ZR-1 #211 Yellow On Beige Beast #2 1992 ZR-1 #427 Black On Black Sold 1985 L98 Blue On Blue Sold Last edited by Karl; 05-18-2014 at 05:44 PM.

05-19-2014	#25
Karl Join Date: May 2013 Location: Chicago Posts: 980	Re: testing the ALCL. poor cold start running One last questions, are the strainers for this car available? If so anyone know the part number or an equal replacement part and or number? Is it necessary to replace the strainers? I never have and I have changed plenty of fuel pumps. Thanks! __________________ 1993 ZR-1 #211 Yellow On Beige Beast #2 1992 ZR-1 #427 Black On Black Sold 1985 L98 Blue On Blue Sold

05-23-2014	#27
Karl Join Date: May 2013 Location: Chicago Posts: 980	Re: testing the ALCL. poor cold start running New fuel pumps arrived last night and will be going in tomorrow! __________________ 1993 ZR-1 #211 Yellow On Beige Beast #2 1992 ZR-1 #427 Black On Black Sold 1985 L98 Blue On Blue Sold

05-23-2014	#28
Schrade Join Date: Dec 2012 Location: NC Posts: 1,786	Re: testing the ALCL. poor cold start running Did you ever do a static pressure test? If you have leaking injectors, new pumps won't make any difference. Getting a new bike pump won't patch a hole in the tire... I think you should do static pressure, and then chart leakdown time. __________________ I'm getting my snappics / threads removed blindly as fast as I can, to get in compliance with copyright / license TOS on the boards here (lots of FSM pages and other copyright / license violations on my part; sorry guys). And thanks to all the guys who didn't whine when I posted those FSM copyrighted / licensed stuff in my threads... ( :thumbsup: [b]and to think I complied with a mod's request to delete a pic of him in a Challenge Car in NCM Museum, so he wouldn't get in hot water)[/b] Thanks to several guys here for sending parts FREE; BearlyFlying, WeGone, Geezer, GoldCylon, and more there, TonyD, mike100, fletchusmc... 1990 #2794; 4L60e Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless, Power Effects 3" [IMG]https://lh5.googleusercontent.com/-GHpfzty7DVU/UQn-0Ru2xAI/AAAAAAAAA14/08mz1p4QLD4/s445/Screenshot-5.png[/IMG]

05-25-2014	#30
Karl Join Date: May 2013 Location: Chicago Posts: 980	Re: testing the ALCL. poor cold start running New fuel pumps and strainers are in and i'm back on the road. No more bog in second gear either. :-) __________________ 1993 ZR-1 #211 Yellow On Beige Beast #2 1992 ZR-1 #427 Black On Black Sold 1985 L98 Blue On Blue Sold