Dual capacity pump wiring - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*scottsdaleowner75* · 09-03-2010, 05:46 PM

Does anyone have a schematic or pics of their own truck on how the dual capacity pump is wired up? I know it is wired to a solenoid on top of the thermostat housing and then to the quadrajet but i havent any idea what color or where the leads are. Infact i believe the connectors are missing. (ino on where i can find thos would be awesome too!) My truck is a 1986 chevy scottsdale with a "H" for my 8th digit in the vin. and the engine was originally a federal emissions low altitude 305 with a non computer controlled quadrajet. I believe the vacuum decal on my radiator support reads YDR. Any help would greatly be appreciated.

D13 · 09-04-2010, 06:13 AM

Dual capacity pump? Gotta confess that's a new one to me. Factory fuel, water, power steering are all mechanical. Since it's a gasser then you shouldn't have a vauum pump. Are you talking about the lean out solenoid on the Qjet?

*nbpro* · 09-04-2010, 09:00 AM

dual capacity accelerator pumps.?
http://www.73-87.com/7387garage/drivetrain/myqjet.htm

good luck

*scottsdaleowner75* · 09-04-2010, 10:13 AM

That be the one NBPRO! Thanks even my haynes, chiltons and the 1986 GM service manual dont show that diagram!

*nbpro* · 09-04-2010, 10:39 AM

google can be your friend

*scottsdaleowner75* · 09-04-2010, 11:51 AM

Google gave me federal emission high altitude and ca emissions. Both a the TPS on the carb. mine doesnt. was at a loss for awhile

*scottsdaleowner75* · 09-04-2010, 02:24 PM

I ended up swapping a non computer controlled carb from the same year. I just couldnt find the electrical connectors locally. I check 4 salvage yards and 3 major chains of parts stores.

09-03-2010, 05:46 PM	#1
scottsdaleowner75 Account Suspended Join Date: Mar 2010 Location: So. Cal, Inland Empire Posts: 199	Dual capacity pump wiring Does anyone have a schematic or pics of their own truck on how the dual capacity pump is wired up? I know it is wired to a solenoid on top of the thermostat housing and then to the quadrajet but i havent any idea what color or where the leads are. Infact i believe the connectors are missing. (ino on where i can find thos would be awesome too!) My truck is a 1986 chevy scottsdale with a "H" for my 8th digit in the vin. and the engine was originally a federal emissions low altitude 305 with a non computer controlled quadrajet. I believe the vacuum decal on my radiator support reads YDR. Any help would greatly be appreciated.

09-04-2010, 06:13 AM	#2
D13 Registered User Join Date: Feb 2007 Location: Memphis MI Posts: 1,851	Re: Dual capacity pump wiring Dual capacity pump? Gotta confess that's a new one to me. Factory fuel, water, power steering are all mechanical. Since it's a gasser then you shouldn't have a vauum pump. Are you talking about the lean out solenoid on the Qjet? __________________ 1987 2 ton 1982 250/TH350 beater in progress Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping Plus a mess o' tractors

09-04-2010, 09:00 AM	#3
nbpro Account Suspended Join Date: Dec 2008 Location: Huntsville,AL Posts: 2,119	Re: Dual capacity pump wiring dual capacity accelerator pumps.? http://www.73-87.com/7387garage/drivetrain/myqjet.htm good luck Last edited by nbpro; 09-04-2010 at 09:14 AM.

09-04-2010, 10:13 AM	#4
scottsdaleowner75 Account Suspended Join Date: Mar 2010 Location: So. Cal, Inland Empire Posts: 199	Re: Dual capacity pump wiring That be the one NBPRO! Thanks even my haynes, chiltons and the 1986 GM service manual dont show that diagram!

09-04-2010, 10:39 AM	#5
nbpro Account Suspended Join Date: Dec 2008 Location: Huntsville,AL Posts: 2,119	Re: Dual capacity pump wiring google can be your friend

09-04-2010, 11:51 AM	#6
scottsdaleowner75 Account Suspended Join Date: Mar 2010 Location: So. Cal, Inland Empire Posts: 199	Re: Dual capacity pump wiring Google gave me federal emission high altitude and ca emissions. Both a the TPS on the carb. mine doesnt. was at a loss for awhile

09-04-2010, 02:24 PM	#7
scottsdaleowner75 Account Suspended Join Date: Mar 2010 Location: So. Cal, Inland Empire Posts: 199	Re: Dual capacity pump wiring I ended up swapping a non computer controlled carb from the same year. I just couldnt find the electrical connectors locally. I check 4 salvage yards and 3 major chains of parts stores.



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