Highboy fuel tank relocation
Thread Starter
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Laughing Gas
Joined: Sep 2018
Posts: 1,223
Likes: 119
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.
I didn't modify the sender because I plan to modify the cluster to look originalish but be able to access all the serial data from the engine. I don't know when I will get time to do that though.
Cargo Master
Joined: Sep 2007
Posts: 2,470
Likes: 535
From: Chandler, AZ
So, did you use and in-tank fuel pump? Looks like there is a pump on frame rail but maybe that is a filter.... What pump did you use exactly?
The 87 up tanks/senders are for in-tank pumps, but could be bypassed.
The 86 and older version have a typical pickup tube and sock.
Going with Holley Sniper which is rated at 650hp, and on nitrous I may get to 500. I think a 255lph pump would do that...
The 87 up tanks/senders are for in-tank pumps, but could be bypassed.
The 86 and older version have a typical pickup tube and sock.
Going with Holley Sniper which is rated at 650hp, and on nitrous I may get to 500. I think a 255lph pump would do that...
Thread Starter
|
Laughing Gas
Joined: Sep 2018
Posts: 1,223
Likes: 119
So, did you use and in-tank fuel pump? Looks like there is a pump on frame rail but maybe that is a filter.... What pump did you use exactly?
The 87 up tanks/senders are for in-tank pumps, but could be bypassed.
The 86 and older version have a typical pickup tube and sock.
Going with Holley Sniper which is rated at 650hp, and on nitrous I may get to 500. I think a 255lph pump would do that...
The 87 up tanks/senders are for in-tank pumps, but could be bypassed.
The 86 and older version have a typical pickup tube and sock.
Going with Holley Sniper which is rated at 650hp, and on nitrous I may get to 500. I think a 255lph pump would do that...
Will you have a carburator or fuel injection?
Cargo Master
Joined: Sep 2007
Posts: 2,470
Likes: 535
From: Chandler, AZ
Holley sniper EFI. Needs 58psi I think. Which pump did you use?
The sniper system can be had with a semi-complete fuel system so considering that route, but easy enough to do an in-tank pump. The burb fuel tank/sender can be had in either flavor, trrying to decide....
The sniper system can be had with a semi-complete fuel system so considering that route, but easy enough to do an in-tank pump. The burb fuel tank/sender can be had in either flavor, trrying to decide....
Thread Starter
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Laughing Gas
Joined: Sep 2018
Posts: 1,223
Likes: 119
Holley sniper EFI. Needs 58psi I think. Which pump did you use?
The sniper system can be had with a semi-complete fuel system so considering that route, but easy enough to do an in-tank pump. The burb fuel tank/sender can be had in either flavor, trrying to decide....
The sniper system can be had with a semi-complete fuel system so considering that route, but easy enough to do an in-tank pump. The burb fuel tank/sender can be had in either flavor, trrying to decide....
so I got a 255l pump but wish I would have gone bigger because I will probably go e85 and may need more pump.
Calculator for pump size: https://www.raceworks.com.au/calcula...mp-calculator/
You may need a good sized pump for a healthy 460 expecially if e85 or flex tune is something you are considering.
Thread Starter
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Laughing Gas
Joined: Sep 2018
Posts: 1,223
Likes: 119
SUM-220627B adapter
CMB-03-0263 regulator and fittings
658510 2 ft line
RUS-658530 4 ft line
SUM-220633-2B female an fitting 1 of 2
SUM-220634-2B female an fitting 2 of 2
SUM-220632B male/male an fitting
So all the above fitting are aluminum. They are anodized so I am not worried about steel/aluminum corrosion but if I was doing it again I would use as much steel as possible. I ended up buy a bunch of fittings later from these guys https://www.discounthydraulichose.com/. You can buy steel fittings for cheap and they are pretty reasonable on making Hydraulic hoses. I used hydraulic hoses for transmission and power steering. I also flared all my steel fuel line to 37 degrees. It was easier to keep the fitting styles the same and 37 degree in used for all lines I have seen on military planes.
Luckily I keep this info in a spreadsheet. It should save time when I working on the truck years from now.
Cargo Master
Joined: Sep 2007
Posts: 2,470
Likes: 535
From: Chandler, AZ
Thanks again for all your help!
You know, the 'fuel' line ends should be red for fuel. Blue is for nitrous....
You know, the 'fuel' line ends should be red for fuel. Blue is for nitrous....
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Cargo Master
Joined: Sep 2007
Posts: 2,470
Likes: 535
From: Chandler, AZ
Nitrous is always a good idea on anything with a motor. I went with a 255lph walbro, but I think it is marginal for the 75 hp shot I plan to run to get me to 500 hp.
Anyhow, thanks again for the info and support,
Cargo Master
Joined: Sep 2007
Posts: 2,470
Likes: 535
From: Chandler, AZ
It looks like you have fuel fill on the left side like original. The suburban's had the fuel fill on the right. Did you mount tank backwards to achieve this? Looks like it is the 25 gallon?
I got my 31g tank and associated parts. The 31g tank has a angle to it for departure clearance. It hangs low so I think I will go with a right side fill. Wish I had the tank before I made the rear cross member.....
I got my 31g tank and associated parts. The 31g tank has a angle to it for departure clearance. It hangs low so I think I will go with a right side fill. Wish I had the tank before I made the rear cross member.....
Thread Starter
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Laughing Gas
Joined: Sep 2018
Posts: 1,223
Likes: 119
It looks like you have fuel fill on the left side like original. The suburban's had the fuel fill on the right. Did you mount tank backwards to achieve this? Looks like it is the 25 gallon?
I got my 31g tank and associated parts. The 31g tank has a angle to it for departure clearance. It hangs low so I think I will go with a right side fill. Wish I had the tank before I made the rear cross member.....
I got my 31g tank and associated parts. The 31g tank has a angle to it for departure clearance. It hangs low so I think I will go with a right side fill. Wish I had the tank before I made the rear cross member.....
Cargo Master
Joined: Sep 2007
Posts: 2,470
Likes: 535
From: Chandler, AZ
The truck had quite the custom hitch welded directly to both the frame and bumper extending up to the axle. Had to cut it all out in pieces. Plan to re-build the whole thing into one piece that bolts on. Truck is going to drag the receiver when off-roading so trying to keep it up as high as possible. The existing setup is already pretty compact. The tank hangs below the hitch by about 1"., but is back farther and has a relief angle on it. Should drag hitch first but tank will need armor/skid plate of some type.
Another question regarding the fuel pump. I have a Walbro 255 lph. I bought a walbro 'GM' style install kit with strainer. The sending unit/fuel hat also came with a install kit. Both have the same strainer/sock that is supposed to snap in. the sizes are way off. I think you have similar pump and same sender. How do you make this work? Thanks
Another question regarding the fuel pump. I have a Walbro 255 lph. I bought a walbro 'GM' style install kit with strainer. The sending unit/fuel hat also came with a install kit. Both have the same strainer/sock that is supposed to snap in. the sizes are way off. I think you have similar pump and same sender. How do you make this work? Thanks
Thread Starter
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Laughing Gas
Joined: Sep 2018
Posts: 1,223
Likes: 119
That base definitely looks different than mine did.
https://www.summitracing.com/parts/vpn-gca758-2 was the kit I got. The kit ended up being useless though. I didn't use a thing out of it besides the pump. Maybe different size sock can be purchased that is available? Is it a genuine walbro? I read there are fakes but mine had numbers on it that verified it was walbro if I remember correctly.
https://www.summitracing.com/parts/vpn-gca758-2 was the kit I got. The kit ended up being useless though. I didn't use a thing out of it besides the pump. Maybe different size sock can be purchased that is available? Is it a genuine walbro? I read there are fakes but mine had numbers on it that verified it was walbro if I remember correctly.
Cargo Master
Joined: Sep 2007
Posts: 2,470
Likes: 535
From: Chandler, AZ
Ah, I see. thanks. Looks like I need a different strainer to work with this pump, that also works with the pickup assembly. crap. Or a different pump. The joys of hot roding.
T1 automotive bought walbro, and the 'walbro' pumps are labeled T1. I think I have the real deal. Bought on amazon for $50.
Conflicting info on the 758-2 pump pressure.
Your experience is very helpful, thanks.
T1 automotive bought walbro, and the 'walbro' pumps are labeled T1. I think I have the real deal. Bought on amazon for $50.
Conflicting info on the 758-2 pump pressure.
Your experience is very helpful, thanks.