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Old 10-18-2017, 04:39 PM   #1
dwntwn
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Stock TBI fuel tankódiesel conversion replace or not?

Hey all,
I'm in the planning stages of a '91 12v conversion on my '88 R20 Suburban. I'm using the stock Cummins lift pump (on the block)

I've heard different opinions on using the stock TBI sender and fuel tank, should I plan on replaceing both?

Its looking like a tank and GM (diesel) sender would run me about $225 + shipping. If I need them I'll drop the money on itóif I can avoid it, I could find something else to spend the money on!

Thanks
~Dave
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1966 c10, short fleet, 402ci 700r4
1988 r20 Suburban 454ci tbi, th400 (12v Cummins soon)
1962 c30 tow truck
1980 shovelhead, hardtail, open primary
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Old 10-23-2017, 10:05 PM   #2
Dieselwrencher
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Re: Stock TBI fuel tankódiesel conversion replace or not?

If your sender is good now, I'd remove it from your tank, remove the gas junk, and add a pick up tube and call it good. You can run a 3/8" on the VE and be fine. Make sure you clean your old tank well and get all that old gas out. On the square burb I did, we replaced the tank and sender for a diesel model because that is what the owner wanted.
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1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread
1976 K30 CC SWB Build Thread

Tired of spark plugs? Check this out.
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Old 10-24-2017, 01:52 PM   #3
dwntwn
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Re: Stock TBI fuel tankódiesel conversion replace or not?

Thanks for the reply!

Did you keep the (Suburban) stock fuel lines on the right frame rail and run a hose around the back of the Cummins block to the mechanical lift pump?
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1966 c10, short fleet, 402ci 700r4
1988 r20 Suburban 454ci tbi, th400 (12v Cummins soon)
1962 c30 tow truck
1980 shovelhead, hardtail, open primary
1998 FXDWG
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Old 10-27-2017, 12:04 AM   #4
Dieselwrencher
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Re: Stock TBI fuel tankódiesel conversion replace or not?

I ran new lines down the LH frame rail to avoid having to go over the drive line.
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Ryan
1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread
1976 K30 CC SWB Build Thread

Tired of spark plugs? Check this out.
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Old 11-03-2017, 12:10 PM   #5
DieselSJ
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Re: Stock TBI fuel tankódiesel conversion replace or not?

A little off topic - what are you using for engine mounts? Any crossmember modifications necessary? I'm planning out that swap for my R30.
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