Installing fuel injectors - ZR-1 Net Registry Forums

mmkkpro · 08-02-2019

Good morning guys, I have a question about installing fuel injectors. Do you take the fuel rails apart when installing the new injectors? The shop manual is not real clear about that, thanks.

Ccmano · 08-02-2019

After you remove the plenum, you will see 4 10mm bolts that hold down the fuel rail. Remove them. Make sure you depressurize the rail by depressing the Schrader valve at the end of the pass side rail. Have plenty of rags ready to soak up gas. Leave the fuel lines attached to the fuel rails. You will be flipping the entire assembly up and over on to the windshield (or wherever it wants to easily go) once removed. I use a slim hammer handle (something strong but soft enough to not marr the injector housing when you pry) to pry the fuel rail assembly up with the injectors attached. The whole assembly should simply pop up and out with injectors still attached to the rail. Take your time, it may require some gentle persuasion in places. Normally they pop out without too much effort. However I have had at least one where the injector O-rings got so hard they didn’t want to release from the IH. Again go slow and work from the ends to pop out one injector at a time, they will come. Here’s a picture of what it should look like when your done with the removal.
Good luck
H

Jagdpanzer · 08-02-2019

You can squirt some WD40 at the base of the injectors where they insert into the injector housing. Then work the rails around a bit to help the O-rings release. Then proceed as Hans suggests above.

Sent from my iPhone using ZR-1 Net Registry

mmkkpro · 08-02-2019

Thank yall very much, going to tackle it in the morning, I'm old school carburetor guy and haven't really done a lot of fuel injection stuff. I appreciate the info very much! Getting closer to firing her up👍👍🏁

Paul Workman · 08-04-2019

It appears to be a 1990 ZR-1, which has also been ported. (NICE!). Same here!

Injector sources:

FIC can fix you up with the STAINLESS STEEL injectors and the appropriate seals (O-rings and plenum gaskets, etc provided by Jerry's Gaskets (a source you should get to know!). Or, as I and many have done, install the Accel injectors #150821 from Summit Racing* (Mine I installed myself in 2010?) and they are working just fine!)

*There is a plastic indexing nub on the Accel injectors that needs to be removed ONLY on those injectors going into the secondary ports. 5 minutes with a Dremel for all 8 was all it took and the connector will snap right on - no problem!

mmkkpro · 08-04-2019

Good morning Paul, first thank you for your reply, I really appreciate all your guys help. I did buy my gaskets from Jerry, he straightened out my order for me and saved me some money, so that was great. Trying to test my secondary parts today, new vacuum pump installed and seems to be running properly. Slowly getting there.
It is a 1990, how can you tell if its been ported? I have tried to contact the original owner without success, so I really know next to nothing about its history other than what the guy I bought it from has told me. Thanks

Z51JEFF · 08-05-2019

Before you put the plenum back on you do want to check the secondary’s and you might want to pressurize the fuel rails to make sure there are no leaks. ITS BEEN AWHILE SINCE IVE DONE THIS SO IF DOING THIS ISN'T AN TOOD IDEA,somebody please advice on this. I remember checking the system when I did my injectors years ago. I can’t remember how to energize the secondary system through the ignition key but that’s the best process,somebody here might know how to do that.

-=Jeff=- · 08-05-2019

Quote:

Originally Posted by Paul Workman

It appears to be a 1990 ZR-1, which has also been ported. (NICE!). Same here!

Injector sources:

FIC can fix you up with the STAINLESS STEEL injectors and the appropriate seals (O-rings and plenum gaskets, etc provided by Jerry's Gaskets (a source you should get to know!). Or, as I and many have done, install the Accel injectors #150821 from Summit Racing* (Mine I installed myself in 2010?) and they are working just fine!)

*There is a plastic indexing nub on the Accel injectors that needs to be removed ONLY on those injectors going into the secondary ports. 5 minutes with a Dremel for all 8 was all it took and the connector will snap right on - no problem!

Paul the posted Picture is Hans' Car

mmkkpro · 08-05-2019

Hey Z51JEFF, I put a new vacuum pump in and did the C17 grounding trick to test the functionality of the secondaries and the seem to be working as described by Marc. I wasn't able to afford the best injectors, so I put Bosh ss injectors in, I have to save up for the best ones. I have to fuel her up as I put a 1994zr1 fuel sending unit and new pumps in. Have the fuses out right now and still have not installed the rebuilt instrument cluster yet, plan on IC, fuel pump fuses, for this weekend. But yea, pressuring up the fuel system before plenum install is a good idea. I tightened up the IH bolts and the breather cover. I really need to take more time and detail the area under the plenum. I really want to start her so I can hear the engine. I am worried about all the marvel mystery oil that was in the cylinders, when we loaded it up on the roll back a lot of oil drained through the exhaust, I removed what I could, she is going to smoke like a freight train for the first little bit. Afraid all that oil may hurt my cats and 02 sensors, I reckon it will eventually burn off.
So if the engine is good and the seller told me it was or is. This winter I will buy the FIC injectors and pull everything out of the valley and do a proper clean up. I'm excited to start her and worried at the same time. I have a 1972 Pontiac 455H.O.bored and stroked, high compression drag engine that I run aviation fuel in but it has no cats and I have read aviation fuel is not good for cats, so we have fuel stations with 93 octane 100% gas reckon I will run that till winter when I plan on long tube headers and exhaust of some sort, maybe hi flow cats. If the engine knocks or smokes reckon a rebuild is in order, I don't even know the mileage yet I'm hoping when I put the IC back in it will pop up, seller told me around 80,000. Sorry if I'm rambling getting excited. I need to clean the pulleys radiator, I have read trash gets in between radiator and oil cooler and ac condenser. I am going to need tires, brakes and the passenger side headlight needs gears. A lot to do, but I'm getting there, I appreciate everybody's help, you guys have been great and very helpful.

32valvZ · 08-05-2019

Quote:

Originally Posted by -=Jeff=-

Paul the posted Picture is Hans' Car

Stupid hip replacement meds are prolly clouding his vision... ask me how I know....

08-02-2019	#2
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,843	Re: Installing fuel injectors After you remove the plenum, you will see 4 10mm bolts that hold down the fuel rail. Remove them. Make sure you depressurize the rail by depressing the Schrader valve at the end of the pass side rail. Have plenty of rags ready to soak up gas. Leave the fuel lines attached to the fuel rails. You will be flipping the entire assembly up and over on to the windshield (or wherever it wants to easily go) once removed. I use a slim hammer handle (something strong but soft enough to not marr the injector housing when you pry) to pry the fuel rail assembly up with the injectors attached. The whole assembly should simply pop up and out with injectors still attached to the rail. Take your time, it may require some gentle persuasion in places. Normally they pop out without too much effort. However I have had at least one where the injector O-rings got so hard they didn’t want to release from the IH. Again go slow and work from the ends to pop out one injector at a time, they will come. Here’s a picture of what it should look like when your done with the removal. Good luck H

08-02-2019	#3
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,646	Re: Installing fuel injectors You can squirt some WD40 at the base of the injectors where they insert into the injector housing. Then work the rails around a bit to help the O-rings release. Then proceed as Hans suggests above. Sent from my iPhone using ZR-1 Net Registry __________________ Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake

08-02-2019	#4
mmkkpro Join Date: Apr 2019 Location: Supply NC Posts: 124	Re: Installing fuel injectors Thank yall very much, going to tackle it in the morning, I'm old school carburetor guy and haven't really done a lot of fuel injection stuff. I appreciate the info very much! Getting closer to firing her up👍👍🏁 Last edited by mmkkpro; 08-02-2019 at 07:30 PM.

08-04-2019	#5
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,466	Re: Installing fuel injectors It appears to be a 1990 ZR-1, which has also been ported. (NICE!). Same here! Injector sources: FIC can fix you up with the STAINLESS STEEL injectors and the appropriate seals (O-rings and plenum gaskets, etc provided by Jerry's Gaskets (a source you should get to know!). Or, as I and many have done, install the Accel injectors #150821 from Summit Racing* (Mine I installed myself in 2010?) and they are working just fine!) There is a plastic indexing nub on the Accel injectors that needs to be removed ONLY on those injectors going into the secondary ports*. 5 minutes with a Dremel for all 8 was all it took and the connector will snap right on - no problem!

08-04-2019	#6
mmkkpro Join Date: Apr 2019 Location: Supply NC Posts: 124	Re: Installing fuel injectors Good morning Paul, first thank you for your reply, I really appreciate all your guys help. I did buy my gaskets from Jerry, he straightened out my order for me and saved me some money, so that was great. Trying to test my secondary parts today, new vacuum pump installed and seems to be running properly. Slowly getting there. It is a 1990, how can you tell if its been ported? I have tried to contact the original owner without success, so I really know next to nothing about its history other than what the guy I bought it from has told me. Thanks

08-02-2019	#1
mmkkpro Join Date: Apr 2019 Location: Supply NC Posts: 124	Installing fuel injectors Good morning guys, I have a question about installing fuel injectors. Do you take the fuel rails apart when installing the new injectors? The shop manual is not real clear about that, thanks.

08-05-2019	#7
Z51JEFF Join Date: Dec 2007 Location: Fremont, CA Posts: 3,087	Re: Installing fuel injectors Before you put the plenum back on you do want to check the secondary’s and you might want to pressurize the fuel rails to make sure there are no leaks. ITS BEEN AWHILE SINCE IVE DONE THIS SO IF DOING THIS ISN'T AN TOOD IDEA,somebody please advice on this. I remember checking the system when I did my injectors years ago. I can’t remember how to energize the secondary system through the ignition key but that’s the best process,somebody here might know how to do that.

08-05-2019	#9
mmkkpro Join Date: Apr 2019 Location: Supply NC Posts: 124	Re: Installing fuel injectors Hey Z51JEFF, I put a new vacuum pump in and did the C17 grounding trick to test the functionality of the secondaries and the seem to be working as described by Marc. I wasn't able to afford the best injectors, so I put Bosh ss injectors in, I have to save up for the best ones. I have to fuel her up as I put a 1994zr1 fuel sending unit and new pumps in. Have the fuses out right now and still have not installed the rebuilt instrument cluster yet, plan on IC, fuel pump fuses, for this weekend. But yea, pressuring up the fuel system before plenum install is a good idea. I tightened up the IH bolts and the breather cover. I really need to take more time and detail the area under the plenum. I really want to start her so I can hear the engine. I am worried about all the marvel mystery oil that was in the cylinders, when we loaded it up on the roll back a lot of oil drained through the exhaust, I removed what I could, she is going to smoke like a freight train for the first little bit. Afraid all that oil may hurt my cats and 02 sensors, I reckon it will eventually burn off. So if the engine is good and the seller told me it was or is. This winter I will buy the FIC injectors and pull everything out of the valley and do a proper clean up. I'm excited to start her and worried at the same time. I have a 1972 Pontiac 455H.O.bored and stroked, high compression drag engine that I run aviation fuel in but it has no cats and I have read aviation fuel is not good for cats, so we have fuel stations with 93 octane 100% gas reckon I will run that till winter when I plan on long tube headers and exhaust of some sort, maybe hi flow cats. If the engine knocks or smokes reckon a rebuild is in order, I don't even know the mileage yet I'm hoping when I put the IC back in it will pop up, seller told me around 80,000. Sorry if I'm rambling getting excited. I need to clean the pulleys radiator, I have read trash gets in between radiator and oil cooler and ac condenser. I am going to need tires, brakes and the passenger side headlight needs gears. A lot to do, but I'm getting there, I appreciate everybody's help, you guys have been great and very helpful.