engine swap, what fuel pump? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

halffast blazer · 10-08-2006, 04:55 PM

i have an '81 k5 4x4, and i have installed a 5.7l fi engine out of a 94 c1500. i am now trying to figure out which way to go for the fuel pump. what year k5 came with fuel injection? i assume they had an in-tank pump. would that be a bolt in swap, or did they change the tanks. any info will be helpful.

edman87 · 10-08-2006, 06:53 PM

87 up k5 had fuel injection. Don't know if tank is different or not, as both mine are FI. The tbi doesn't require that much pressure, so an inline elec pump will work fine if you don't want to put pump in tank.

Jonboy · 10-09-2006, 08:24 AM

The tanks are the same as suburban tanks, those are a lot easter to find around here.

edman87 · 10-09-2006, 10:11 AM

A k5 tank mounts behind rear axle, a sub has saddle tanks. They are way different. That would be the reason the k5 has has a flat floor and subs have a hump under the seat like a truck.

Jonboy · 10-09-2006, 01:08 PM

Only the pickups have saddle tanks.

bagged74 · 10-09-2006, 01:44 PM

Quote:

Originally Posted by edman87

a sub has saddle tanks. They are way different. .

Not true!

**Captkaos** · 10-09-2006, 03:58 PM

Any pump from a TBI motor will work on the sending unit from a '87-up Blazer/Burb.

edman87 · 10-09-2006, 04:06 PM

OK, looks like I am wrong on this one. How do some subs have dual tanks? Some do have dual tanks, right? I havn't messed with a sub in a loooong time. I remember pops sub having a 40 gal single tank, so I guess you are right, no way a saddle tank could fit 40 gals. Also no way a 40 gal tank would fit a K5.
I WAS WRONG!

**Captkaos** · 10-10-2006, 06:06 PM

Suburban only had rear tanks. 25, 31 or 40 gallon were availible.

halffast blazer · 10-10-2006, 07:48 PM

Quote:

Originally Posted by Captkaos

Any pump from a TBI motor will work on the sending unit from a '87-up Blazer/Burb.

so if i have the entire sending unit/pump assembly from the 94 truck, i can use the pump with my blazers sending unit? or will i have to have the sending unit from a fuel injection blazer?

edman87 · 10-10-2006, 08:03 PM

those 2 pumps would be the same, right? The top part that sits on the tankmight be different, but I think they are the same too.

**Captkaos** · 10-11-2006, 03:08 PM

I can't say for 100% that the sending unit it the same, I thing it was up to 92, but... The pump will definitely work. I will be using a Corvette pump on mine.

10-08-2006, 04:55 PM	#1
halffast blazer Registered User Join Date: Mar 2005 Location: Texarkana, TX Posts: 65	engine swap, what fuel pump? i have an '81 k5 4x4, and i have installed a 5.7l fi engine out of a 94 c1500. i am now trying to figure out which way to go for the fuel pump. what year k5 came with fuel injection? i assume they had an in-tank pump. would that be a bolt in swap, or did they change the tanks. any info will be helpful. __________________ 67 Chevrolet C10 StepSide 81 Chevrolet Blazer 4WD 82 GMC Jimmy 2WD

10-08-2006, 06:53 PM	#2
edman87 junk collector Join Date: Dec 2004 Location: above Baton Rouge, LA Posts: 693	Re: engine swap, what fuel pump? 87 up k5 had fuel injection. Don't know if tank is different or not, as both mine are FI. The tbi doesn't require that much pressure, so an inline elec pump will work fine if you don't want to put pump in tank. __________________ '87/89/76 K5 in progress '99 K2500 short crew '91 camaro rs '98 jeep tj '52 willys cj3a

10-09-2006, 08:24 AM	#3
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: engine swap, what fuel pump? The tanks are the same as suburban tanks, those are a lot easter to find around here.

10-09-2006, 10:11 AM	#4
edman87 junk collector Join Date: Dec 2004 Location: above Baton Rouge, LA Posts: 693	Re: engine swap, what fuel pump? A k5 tank mounts behind rear axle, a sub has saddle tanks. They are way different. That would be the reason the k5 has has a flat floor and subs have a hump under the seat like a truck. __________________ '87/89/76 K5 in progress '99 K2500 short crew '91 camaro rs '98 jeep tj '52 willys cj3a

10-09-2006, 01:08 PM	#5
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: engine swap, what fuel pump? Only the pickups have saddle tanks.

10-09-2006, 03:58 PM	#7
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	Re: engine swap, what fuel pump? Any pump from a TBI motor will work on the sending unit from a '87-up Blazer/Burb. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

10-09-2006, 04:06 PM	#8
edman87 junk collector Join Date: Dec 2004 Location: above Baton Rouge, LA Posts: 693	Re: engine swap, what fuel pump? OK, looks like I am wrong on this one. How do some subs have dual tanks? Some do have dual tanks, right? I havn't messed with a sub in a loooong time. I remember pops sub having a 40 gal single tank, so I guess you are right, no way a saddle tank could fit 40 gals. Also no way a 40 gal tank would fit a K5. I WAS WRONG! __________________ '87/89/76 K5 in progress '99 K2500 short crew '91 camaro rs '98 jeep tj '52 willys cj3a

10-10-2006, 06:06 PM	#9
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	Re: engine swap, what fuel pump? Suburban only had rear tanks. 25, 31 or 40 gallon were availible. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

10-10-2006, 08:03 PM	#11
edman87 junk collector Join Date: Dec 2004 Location: above Baton Rouge, LA Posts: 693	Re: engine swap, what fuel pump? those 2 pumps would be the same, right? The top part that sits on the tankmight be different, but I think they are the same too. __________________ '87/89/76 K5 in progress '99 K2500 short crew '91 camaro rs '98 jeep tj '52 willys cj3a

10-11-2006, 03:08 PM	#12
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	Re: engine swap, what fuel pump? I can't say for 100% that the sending unit it the same, I thing it was up to 92, but... The pump will definitely work. I will be using a Corvette pump on mine. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com



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