Fuel Pumps/Sending Unit - ZR-1 Net Registry Forums

1990ZR1#1012 · 01-21-2022

Ah the joy of Ownership!!!

Believe my fuel pump(s) are going out. Ordered the Walbro replacement from Lingenfelter and picked up a new K&N Fuel Filter. No indication of a sending unit issue, which is good as they appear to be difficult to find, but thought while I am doing the fuel pumps I might as well see if I can replace the Sending Unit as well.

As I am waiting on the Walbro, for those who have had to or opted to replace the sending unit, where did you find one or is there a substitute that can be used?

secondchance · 01-21-2022

I recall reading Marc Heibeck?s ?how to? adopt either standard C4 or generic fuel sender onto LT5 fuel pump assembly. May be someone here can help you find the article or post.

Andy · 01-22-2022

It?s on Marc?s website - ZR1Specialist.com.
http://www.zr1specialist.com/HAT%20W...l%20System.htm.
At least that is the one I know about.

I had an original one renewed by a company that specialized in renewing antique gauges for cars, etc. I think I used Bob?s Speedometer, somewhere in lower Michigan. Was working well last I saw it.

1990ZR1#1012 · 01-22-2022

Thank you both. I'll head over to Marc's site and check it out. Appreciate the indication!

Jcsws6 · 01-22-2022

I converted one of mine to a single pump setup. I followed Marc's writeup and it performs flawless as does the fuel gauge. You can get a good quality new sender for a base car from Rockauto. I'm running their unit in one of my LT4 cars and a zr-1. Add the pump of your choice, a little reversable wiring and your all set. Planning to do it again in another of my zr-1s shortly. Marc can also repair the original sender if you want to send it in.

1990ZR1#1012 · 01-29-2022

Tackled this today...two new Airtex Fuel Pumps E3420 and a new K&N Fuel Filter PF-1000. Wasn't as much of a job as I had thought it was going to be...thankfully!!! LOL Seems to be running just fine now. Will give it a bit more of a drive tomorrow and confirm that all is working without issue.

Bruce Hazell · 03-05-2022

I remember some years ago needing to replace a fuel pump in my 91..the original GM part # for the Corvette fuel pump at a local dealer was very expensive...after searching elsewhere someone on the site said to check out the same part number on a Suburban fuel pump. Went back to dealer...sure enough same part number for both vehicles...considerably cheaper to buy the one for the Suburban

01-21-2022	#2
secondchance Join Date: Aug 2006 Location: McLean, VA Posts: 3,723	Re: Fuel Pumps/Sending Unit I recall reading Marc Heibeck?s ?how to? adopt either standard C4 or generic fuel sender onto LT5 fuel pump assembly. May be someone here can help you find the article or post.

01-22-2022	#3
Andy Join Date: Aug 2014 Location: Chantilly, VA Posts: 37	Re: Fuel Pumps/Sending Unit It?s on Marc?s website - ZR1Specialist.com. http://www.zr1specialist.com/HAT%20W...l%20System.htm. At least that is the one I know about. I had an original one renewed by a company that specialized in renewing antique gauges for cars, etc. I think I used Bob?s Speedometer, somewhere in lower Michigan. Was working well last I saw it. __________________ 1990 black on black #1042 - sadly - sold 1993 Ruby #140 - stock 1991 QB #1608 - heads and top end ported, Watson headers, B&B 3"exhaust, Haibeck chip, 4.10 gears

01-22-2022	#4
1990ZR1#1012 Join Date: Jul 2021 Location: Littleton Posts: 21	Re: Fuel Pumps/Sending Unit Thank you both. I'll head over to Marc's site and check it out. Appreciate the indication!

01-22-2022	#5
Jcsws6 Join Date: May 2021 Location: Freeburg IL Posts: 50	Re: Fuel Pumps/Sending Unit I converted one of mine to a single pump setup. I followed Marc's writeup and it performs flawless as does the fuel gauge. You can get a good quality new sender for a base car from Rockauto. I'm running their unit in one of my LT4 cars and a zr-1. Add the pump of your choice, a little reversable wiring and your all set. Planning to do it again in another of my zr-1s shortly. Marc can also repair the original sender if you want to send it in.

01-29-2022	#6
1990ZR1#1012 Join Date: Jul 2021 Location: Littleton Posts: 21	Re: Fuel Pumps/Sending Unit Tackled this today...two new Airtex Fuel Pumps E3420 and a new K&N Fuel Filter PF-1000. Wasn't as much of a job as I had thought it was going to be...thankfully!!! LOL Seems to be running just fine now. Will give it a bit more of a drive tomorrow and confirm that all is working without issue.

01-21-2022	#1
1990ZR1#1012 Join Date: Jul 2021 Location: Littleton Posts: 21	Fuel Pumps/Sending Unit Ah the joy of Ownership!!! Believe my fuel pump(s) are going out. Ordered the Walbro replacement from Lingenfelter and picked up a new K&N Fuel Filter. No indication of a sending unit issue, which is good as they appear to be difficult to find, but thought while I am doing the fuel pumps I might as well see if I can replace the Sending Unit as well. As I am waiting on the Walbro, for those who have had to or opted to replace the sending unit, where did you find one or is there a substitute that can be used?

03-05-2022	#7
Bruce Hazell Join Date: Sep 2021 Location: BURLINGTON,Ontario,Canada Posts: 12	Re: Fuel Pumps/Sending Unit I remember some years ago needing to replace a fuel pump in my 91..the original GM part # for the Corvette fuel pump at a local dealer was very expensive...after searching elsewhere someone on the site said to check out the same part number on a Suburban fuel pump. Went back to dealer...sure enough same part number for both vehicles...considerably cheaper to buy the one for the Suburban