Highboy fuel tank relocation
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Laughing Gas
Joined: Sep 2018
Posts: 1,223
Likes: 119
Highboy fuel tank relocation
I am doing a coyote swap on my truck and needed to upgrade the fuel system. I also do not care for the tank being behind the seat.
The fuel tank is a replacement tank for a 87 suburban. Suburbans continue the narrow frame rails like the highboy and 87 had fuel injection so I can use the sending unit with a upgraded fuel pump.
Tank with other goodies.
Rear cross member fabrcated
Tube for fuel neck and marine filler nozzle and cap.
I have the front cross member made but don't have any pics. I will hopefully remember to take pics and get the tank bolted in and lines ran in a month or so.
The fuel tank is a replacement tank for a 87 suburban. Suburbans continue the narrow frame rails like the highboy and 87 had fuel injection so I can use the sending unit with a upgraded fuel pump.
Tank with other goodies.
Rear cross member fabrcated
Tube for fuel neck and marine filler nozzle and cap.
I have the front cross member made but don't have any pics. I will hopefully remember to take pics and get the tank bolted in and lines ran in a month or so.
Thread Starter
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Laughing Gas
Joined: Sep 2018
Posts: 1,223
Likes: 119
https://www.speedwaymotors.com/Speedway-Fuel-Level-Gauge-Sending-Unit-Interface-Module,66534.html
I may end up building a custom gauge cluster but I have not gotten that far yet.
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
Thread Starter
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Laughing Gas
Joined: Sep 2018
Posts: 1,223
Likes: 119
Thanks Jeff! I was going to link that thread since that is where I learned of the tank and I plan on putting my filler in the same spot but hadn't gotten around to it.
I though about modifying the sender but think I may did something different with the gauges. I would prefer the dash gauges to have numbers so I can see what is going on better. Modifying the sender is still an option at this point though.
I though about modifying the sender but think I may did something different with the gauges. I would prefer the dash gauges to have numbers so I can see what is going on better. Modifying the sender is still an option at this point though.
Thread Starter
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Laughing Gas
Joined: Sep 2018
Posts: 1,223
Likes: 119
A little more progress has been made. I hope to have the tank in and filler done soon. I need to get the harness finished in the rear and then the tank can go in.
Tank ready to go in.
Fwd tank cross member in.
Went ahead and bought a new receiver so I won't have to pull the tank later to bolt one up.
New fuel filter/regular and steel lines
Another line pic
Fuel lines done. Still need to get the harness done and brake line terminated.
Tank ready to go in.
Fwd tank cross member in.
Went ahead and bought a new receiver so I won't have to pull the tank later to bolt one up.
New fuel filter/regular and steel lines
Another line pic
Fuel lines done. Still need to get the harness done and brake line terminated.
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Laughing Gas
Joined: Sep 2018
Posts: 1,223
Likes: 119
I got the fuel system complete. I don't have a picture of the tank in but it is hidden by the receiver anyway.
Fuel filler neck. A charcoal canester for a motorcycle is hidden behind the fuel filler neck also so I don't have to smell fuel fumes.
Boat filler. If I had to do it over I would get the filer with a 45 degree angle and do a little more metal work.
Fuel filter/regular installed.
Fuel line from fuel filter to braided line the runs to motor.
Braided line.
That is pretty much it for the fuel system besides the wiring for power and the gauge. The wires are ran up to the cab so I will tackle that stuff with wiring for the truck.
Fuel filler neck. A charcoal canester for a motorcycle is hidden behind the fuel filler neck also so I don't have to smell fuel fumes.
Boat filler. If I had to do it over I would get the filer with a 45 degree angle and do a little more metal work.
Fuel filter/regular installed.
Fuel line from fuel filter to braided line the runs to motor.
Braided line.
That is pretty much it for the fuel system besides the wiring for power and the gauge. The wires are ran up to the cab so I will tackle that stuff with wiring for the truck.
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Lead Driver
Joined: Jul 2017
Posts: 9,597
Likes: 1,172
From: San Jose, CA
Very sanitary tube bending/routing and bracketry fabbing! Nice indeed.
So the filter is the return line to the tank then? And you say it's also a regulator? Is it one for a Coyote, or some other setup?
Does the Coyote run a returnless system? And if so, wouldn't the computer want to control the pump output? Or instead of throttling the pump (which I'm not sure any of them do?) does it just rely on the filter being the correct regulator as well?
Interesting stuff!
Thanks
Paul
So the filter is the return line to the tank then? And you say it's also a regulator? Is it one for a Coyote, or some other setup?
Does the Coyote run a returnless system? And if so, wouldn't the computer want to control the pump output? Or instead of throttling the pump (which I'm not sure any of them do?) does it just rely on the filter being the correct regulator as well?
Interesting stuff!
Thanks
Paul
Thread Starter
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Laughing Gas
Joined: Sep 2018
Posts: 1,223
Likes: 119
Very sanitary tube bending/routing and bracketry fabbing! Nice indeed.
So the filter is the return line to the tank then? And you say it's also a regulator? Is it one for a Coyote, or some other setup?
Does the Coyote run a returnless system? And if so, wouldn't the computer want to control the pump output? Or instead of throttling the pump (which I'm not sure any of them do?) does it just rely on the filter being the correct regulator as well?
Interesting stuff!
Thanks
Paul
So the filter is the return line to the tank then? And you say it's also a regulator? Is it one for a Coyote, or some other setup?
Does the Coyote run a returnless system? And if so, wouldn't the computer want to control the pump output? Or instead of throttling the pump (which I'm not sure any of them do?) does it just rely on the filter being the correct regulator as well?
Interesting stuff!
Thanks
Paul
Thanks!
Thread Starter
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Laughing Gas
Joined: Sep 2018
Posts: 1,223
Likes: 119
RockAuto fuel tank options. Some of the options give dimensions. I would probably go with the bigger tank if I was doing it again.
RockAuto sending unit
I would use this fuel fill if I was doing it again: Amazon link. You can search the name white water if would rather not use Amazon. It is a little tight getting the the fuel nozzle in how I did mine. I may modify it down the road.
Look forward to seeing how you do your fuel tank!
RockAuto sending unit
I would use this fuel fill if I was doing it again: Amazon link. You can search the name white water if would rather not use Amazon. It is a little tight getting the the fuel nozzle in how I did mine. I may modify it down the road.
Look forward to seeing how you do your fuel tank!
Thread Starter
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Laughing Gas
Joined: Sep 2018
Posts: 1,223
Likes: 119
I used this to continue using the stock fuel gauge: Fuel gauge interface mod. Cannot say I recommend it as of yet since the one I received did not work. It is just hooked up directly now so the gauge is working in reverse. I will probably get another and hope it works.
Cargo Master
Joined: Sep 2007
Posts: 2,470
Likes: 535
From: Chandler, AZ
Thanks for all the info so I can be lazy and benefit from your research, testing and $.
As for the level sender, I think I will modify like Tomahawk did. I bought a new sender for the ford aux tank, so I can seal the pot out of it and graft it into the GM hardware.
Plan B would be to make a converter out of a micro controller and a FET. It would be much more simple if circuit current was low, could use a digital pot, but a FET can be used to make a variable resistor. Use Micro's ADC/current source to read GM sender resistance and then drive FET with corresponding ford resistance value with a lookup table.
As for the level sender, I think I will modify like Tomahawk did. I bought a new sender for the ford aux tank, so I can seal the pot out of it and graft it into the GM hardware.
Plan B would be to make a converter out of a micro controller and a FET. It would be much more simple if circuit current was low, could use a digital pot, but a FET can be used to make a variable resistor. Use Micro's ADC/current source to read GM sender resistance and then drive FET with corresponding ford resistance value with a lookup table.