Difference in a TBI and a Carb Fuel Sending unit - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Locked1 · 04-23-2010, 10:29 AM

I currently have an in line walbro for my tbi but would rather go to an in tank pump. Anybody done this?

glock35ipsc · 04-23-2010, 12:32 PM

The sending unit for the TBI will have three ports: feed, return, and vent/evap (well, at least running to the charcoal canister). It will also have the pump placed in the tank on the S/U.

The tanks are physically the same, except the 87 tanks will have a bowl that the pump pickup sits in to keep the pump from cavitating. It will still work with older tanks, but at around 1/4 tank of fuel left you might notice that the engine stall or dies when you come to a sudden hard stop or during hard cornering. My 85 ran TBI with the original tanks just fine until I swapped to a 5.3L, than I switched out to 87 tanks.

All you would need to run in-tank pumps are TBI sending units:

Sending unit, 1987, D/S, Dorman #692027, $94.00 ea, rockauto.com
Sending unit, 1987, P/S, Dorman #692044, $101.00 ea, rockauto.com

Locked1 · 04-23-2010, 02:09 PM

I sure do appreciate you response, thanks!

I just wanted to ensure the tank was deep enough and that it would fit!

04-23-2010, 10:29 AM	#1
Locked1 Registered User Join Date: Aug 2009 Location: White House, TN Posts: 13	Can I put an intank Fuel Pump Sending Unit in a 86 Tank I currently have an in line walbro for my tbi but would rather go to an in tank pump. Anybody done this? Last edited by Locked1; 04-23-2010 at 12:08 PM. Reason: Misleading title

04-23-2010, 12:32 PM	#2
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,684	Re: Difference in a TBI and a Carb Fuel Sending unit The sending unit for the TBI will have three ports: feed, return, and vent/evap (well, at least running to the charcoal canister). It will also have the pump placed in the tank on the S/U. The tanks are physically the same, except the 87 tanks will have a bowl that the pump pickup sits in to keep the pump from cavitating. It will still work with older tanks, but at around 1/4 tank of fuel left you might notice that the engine stall or dies when you come to a sudden hard stop or during hard cornering. My 85 ran TBI with the original tanks just fine until I swapped to a 5.3L, than I switched out to 87 tanks. All you would need to run in-tank pumps are TBI sending units: Sending unit, 1987, D/S, Dorman #692027, $94.00 ea, rockauto.com Sending unit, 1987, P/S, Dorman #692044, $101.00 ea, rockauto.com __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE Last edited by glock35ipsc; 04-23-2010 at 12:35 PM.

04-23-2010, 02:09 PM	#3
Locked1 Registered User Join Date: Aug 2009 Location: White House, TN Posts: 13	Re: Difference in a TBI and a Carb Fuel Sending unit I sure do appreciate you response, thanks! I just wanted to ensure the tank was deep enough and that it would fit!

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