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Old 07-27-2017, 10:51 PM   #1026
88lowrider
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Re: Tbi swap build thread

I don't have the answers but stumbled onto this thread and like what I see.
I have my Dads old 1979 Chev 4x4 pickup that has less than 48K on it.
I was thinking of pulling the top off the engine and going with a early EFI with the first generation computer ( like my 1988 GMC full size lowrider that gets 19.8mpg).
The game plan is to find a Donner and switch it over to the EFI. Now I know the fuel tank will need to be swapped too. Tanks look the same between my 79 and 88 so might just luck out.
Right now, still in the process of replacing about Everything around my 88 lowrider engine that is at 170k crate motor and fresh build on the transmission at less than 6K. The fellow that did the transmission also uses that transmission for racing so I got a good build on it.

So, will be watching and learning.

Helmar
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Old 07-28-2017, 12:41 PM   #1027
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Re: Tbi swap build thread

I will post in this one so I have it for future reference. I am putting a TBI 350 in my Jeep some time soon.
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Old 07-28-2017, 01:08 PM   #1028
rfmaster
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Re: Tbi swap build thread

Wwes

I have to look up FP sending unit wiring. Usually it is a three wire configuration: FP +12, Common ground, fuel level. Fuel level is a resistance 0 to 90 Ohms.

According to Pollack Data sheet 42-159 fuel tank switch can handle OE pump pressures 65 PSI deadheaded. Should be just fine for TBI/TPI rated pumps.
http://products.pollakaftermarket.co...n-valve/42-159

Check supplied diagram for dual tank operation
http://products.pollakaftermarket.co...S_41-revdd.pdf

Factory wiring at the FP sending unit.
Tan-white - FP +12Vdc, circuit #120
Pink - fuel gauge, circuit #30
Black - Ground return, Circuit #150

//RF
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Old 07-28-2017, 01:42 PM   #1029
Wwes
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Re: Tbi swap build thread

Big help, thanks sir!

Where could I get the connectors for the wire harnesses, or should I just splice/build my own?

(I'm new to wiring and such this will be an experience)
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Old 07-28-2017, 02:22 PM   #1030
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Re: Tbi swap build thread

Quote:
Originally Posted by Wwes View Post
Big help, thanks sir!

Where could I get the connectors for the wire harnesses, or should I just splice/build my own?

(I'm new to wiring and such this will be an experience)
Well, it all depends how involved do you want to get with making your harness robust. In my case I can assemble weather pack connector from scratch. If you go this far use brand new Delphi connector bodies, wire insulators and pins. Assembly requires having a correct crimping tool. Purchasing a weather pack kit goes a long way. If you do not have access to connector bodies and crimping tool you can source a pig tail from JY. However, be aware that plastic gets brittle over years and pin fitment leads to corrosion. If you live in rust belt area these plugs are exposed to corrosive salt mix over years of service. IMHO not worth it.

It does not look like Pico offers a brand new service pigtails for this circuit. I would double check FP plug against catalog drawing to verify P/N.

Fuel tank plug body 12020829 - 3-way, female
Harness side Socket body 12020827 - 3-way, Male

Connector Pins
OEM# | Description | AWG Gauge
12124581 | tin brass, female | 12
12124580 | tin brass, female | 16 -14
12089188 | tin brass, female | 20 -18
12020801 | tin brass, female | 24 -22
12124587 | tin brass, male | 12
12124582 | tin brass, male |16 - 14
12089040 | tin brass, male | 20 -18
12089307 | tin brass, male | 24 - 22

//RF
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1975 Chevrolet C20 longbed
350/700R4! with 3inch body lift
Dual Flowmasters Super 40's!
TBI retrofit completed (2007-07-29)
New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17)
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Old 08-04-2017, 02:00 PM   #1031
rfmaster
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Re: Tbi swap build thread

Quote:
Originally Posted by Wwes View Post
Big help, thanks sir!

Where could I get the connectors for the wire harnesses, or should I just splice/build my own?

(I'm new to wiring and such this will be an experience)
So what is the status on your project???

//RF
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"The Beast"

1975 Chevrolet C20 longbed
350/700R4! with 3inch body lift
Dual Flowmasters Super 40's!
TBI retrofit completed (2007-07-29)
New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17)
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Old 08-06-2017, 10:33 PM   #1032
Wwes
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Re: Tbi swap build thread

Hey RF I didn't forget you! Been on vacation for the last week so I'll work on it again next weekend. Expect an update/pictures then. Still not sure on how I'll handle the wiring, there aren't any squares around here to pick parts from!
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Old 08-07-2017, 02:08 AM   #1033
rfmaster
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Re: Tbi swap build thread

Quote:
Originally Posted by Wwes View Post
Hey RF I didn't forget you! Been on vacation for the last week so I'll work on it again next weekend. Expect an update/pictures then. Still not sure on how I'll handle the wiring, there aren't any squares around here to pick parts from!
Ahhh - I can use a vacation as well, but work keeps me busy. What else is new!

If push comes to shove 1988-1990 B-bodies can a source (Caprice Classic equipped with LO3 or LO5) for some of the EFI related parts.
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"The Beast"

1975 Chevrolet C20 longbed
350/700R4! with 3inch body lift
Dual Flowmasters Super 40's!
TBI retrofit completed (2007-07-29)
New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17)
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Old 08-14-2017, 07:33 PM   #1034
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Re: Tbi swap build thread

Glad to see this thread is still up and helping folks out!
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Old 08-15-2017, 11:01 AM   #1035
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Re: Tbi swap build thread

This is a great thread. I used it for reference several times when doing the install in my 74.







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Old 08-15-2017, 10:15 PM   #1036
Wwes
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Re: Tbi swap build thread

Looks great Kevin, nice and clean. Stick around I'll have more questions I'm sure!
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Old 09-13-2017, 09:48 PM   #1037
Wwes
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Re: Tbi swap build thread

Hey RF - I am making progress again.

I have a full fuel harness from a donor truck. I'm going to tackle that this weekend so I'll have another question then, but first...

Do I need to replace the fuel selector switch with a 87 one?
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