Fuel Sending Unit - Page 3 - ZR-1 Net Registry Forums

W i l l · 04-03-2019

I considered a standard C4 sending unit, but decided to stick with the dual pump setup to feed the 1000 HP TT.

I was thinking that no programming changes would be required even if the secondaries throttle plates are still in place as long as the pump you use will provide enough fuel for full power. It will run off the primary fuel pump electrical circuit so the fuel will be available all the time.

indy91zr1 · 04-03-2019

One thing to consider is that just leaving it plugged into the stock wiring it may not net you the voltage you need to run those pumps at that power level. With it hardwired to a relay off the battery it will basically get around 13-14volts while running. While if hooked to the stock wiring it might only read 11.5-12 volts. I am not certain as I am used to cars that are newer so they have an actual fuel control module. 1000 hp tt sounds pretty sweet.

mmitton · 04-09-2019

Same problem for my 90 - the fuel gauge hasn't worked for a long time. It always shows empty. Tried to find a replacement with no luck so after some searching I found a place that claims to be able to rebuild the one I have. I'm a little hesitant so I'm wondering if any of you have ever heard of them or perhaps used them. Here's the link: http://www.tristarrradiator.com/

dredgeguy · 04-09-2019

Nice find

Young1 · 04-11-2019

Mmitton. Precast1 had same issue as you on his 1,700 mile 90. I fixed his with a pencil eraser and a solder gun. Eraser cleaned the rheostat surface. We discovered lack of continuity across a solder joint. Re soldered the joint and all was well. We figured it had a micro break is the joint unseen to the eye.
I would be glad to do the same for yours if sent to me. Send PM

Sent from my iPhone using ZR-1 Net Registry

Young1 · 04-11-2019

Is Marc Haibeck offering a service to rebuild our in tank units? Pumps and sending device?

Sent from my iPhone using ZR-1 Net Registry

mmitton · 04-14-2019

Thanks Steve Young - PM sent.

04-03-2019	#21
W i l l Join Date: Jul 2005 Posts: 77	Re: Fuel Sending Unit I considered a standard C4 sending unit, but decided to stick with the dual pump setup to feed the 1000 HP TT. I was thinking that no programming changes would be required even if the secondaries throttle plates are still in place as long as the pump you use will provide enough fuel for full power. It will run off the primary fuel pump electrical circuit so the fuel will be available all the time.

04-03-2019	#22
indy91zr1 Join Date: Jun 2018 Location: fishers,indiana Posts: 76	Re: Fuel Sending Unit One thing to consider is that just leaving it plugged into the stock wiring it may not net you the voltage you need to run those pumps at that power level. With it hardwired to a relay off the battery it will basically get around 13-14volts while running. While if hooked to the stock wiring it might only read 11.5-12 volts. I am not certain as I am used to cars that are newer so they have an actual fuel control module. 1000 hp tt sounds pretty sweet.

04-09-2019	#23
mmitton Join Date: Nov 2018 Location: Arizona and Wyoming Posts: 4	Re: Fuel Sending Unit Same problem for my 90 - the fuel gauge hasn't worked for a long time. It always shows empty. Tried to find a replacement with no luck so after some searching I found a place that claims to be able to rebuild the one I have. I'm a little hesitant so I'm wondering if any of you have ever heard of them or perhaps used them. Here's the link: http://www.tristarrradiator.com/

04-09-2019	#24
dredgeguy Join Date: Aug 2012 Location: Ellicott City, MD Posts: 1,630	Re: Fuel Sending Unit Nice find __________________ Charlie __________ Dredgeguy WAZOO Member 1992 Bright Red/Black ZR1 #246 Dana 4:10 gears Polished LT5 by Haibeck Polished Fikse FM5's with Michelin Pilot Sport 2 Stainless Works headers and cats with Corsa

04-11-2019	#25
Young1 Join Date: Sep 2016 Location: Ocala, FL Posts: 870	Re: Fuel Sending Unit Mmitton. Precast1 had same issue as you on his 1,700 mile 90. I fixed his with a pencil eraser and a solder gun. Eraser cleaned the rheostat surface. We discovered lack of continuity across a solder joint. Re soldered the joint and all was well. We figured it had a micro break is the joint unseen to the eye. I would be glad to do the same for yours if sent to me. Send PM Sent from my iPhone using ZR-1 Net Registry __________________ Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much.

04-11-2019	#26
Young1 Join Date: Sep 2016 Location: Ocala, FL Posts: 870	Re: Fuel Sending Unit Is Marc Haibeck offering a service to rebuild our in tank units? Pumps and sending device? Sent from my iPhone using ZR-1 Net Registry __________________ Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much.

04-14-2019	#27
mmitton Join Date: Nov 2018 Location: Arizona and Wyoming Posts: 4	Re: Fuel Sending Unit Thanks Steve Young - PM sent.