Windshield washer pump doesn't work... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jakes-66-K10 · 06-23-2005, 12:48 PM

I can't figure this one out. Originally my trucks's wipers weren't working. So I replaced the entire assembly from a scrapyard find, washer pump and all. Now I have wipers that work great, but can't get fluid to spray on the window. So then I figured I'd rebuild the pump assembly. Did that last night with an autozone rebuild kit, and exactly the same problem. I even swapped out the pump from my old wiper motor assembly, still nothing.

Any ideas? I don't even know what to check next?

farside847 · 06-23-2005, 12:50 PM

does it click or make any noise at all? If it does its a plumbing problem. If not it might be electrical.

Jakes-66-K10 · 06-23-2005, 12:57 PM

Yeah, I can hear it trying to work. But no water flowing, I should be able to put my finger on the hose that leads into the washer reservoir and feel a vacuum right? Maybe I can try hooking an air compressor up to one end of the hoses, to tell if they are plugged up...

kaycee · 06-23-2005, 01:32 PM

I had to put a aftermarket pump by my resevior to get it to pump,I did the same as you with no luck

Robert1970C20rstbukt · 06-23-2005, 01:37 PM

The rubber seal on the "piston" inside the washer pump might be so dry rotted that it can't pull a vacuum. I had that happen to me with about 6 different pumps.

chickenwing · 06-23-2005, 01:43 PM

If the pump actually works (wich I doubt) pull a line off of the nozzle and try it then. Nozzles get plugged.

It's tough to find a good used washer pump. The re-build kits only come with the check valves and washers. The main problem with em is the lil cam lobe on the pump wears down and makes it VERY hard to actuate. I've figured out how to re curve the cam lobe. Next problem is the cylinder walls are usually gouged and water will leak past the piston into your cab. I have thrown away good money trying to figure out how to rebuild this pump cheaply. Played with later years/models looking for a good donor parts. Everything was trash.

Best bets. Junk it. If you are stuck on factory (like me) go buy a new one. My non-delco one was $29.00. You have to get it from one of the Chevy truck vendors. the parts houses do not have a the mechanical one. If you don;t mined a generic solid-state pump, you can buy them everywhere for around $20.

Edit: Trust me. It will be cheaper in the long run.

06-23-2005, 12:48 PM	#1
Jakes-66-K10 Registered User Join Date: Aug 2004 Location: Idaho Posts: 640	Windshield washer pump doesn't work... I can't figure this one out. Originally my trucks's wipers weren't working. So I replaced the entire assembly from a scrapyard find, washer pump and all. Now I have wipers that work great, but can't get fluid to spray on the window. So then I figured I'd rebuild the pump assembly. Did that last night with an autozone rebuild kit, and exactly the same problem. I even swapped out the pump from my old wiper motor assembly, still nothing. Any ideas? I don't even know what to check next?

06-23-2005, 12:50 PM	#2
farside847 Registered User Join Date: Feb 2005 Location: Bay Area, California Posts: 995	does it click or make any noise at all? If it does its a plumbing problem. If not it might be electrical. __________________ 1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree

06-23-2005, 01:32 PM	#4
kaycee Registered User Join Date: Jan 2000 Location: Wyoming USA Posts: 2,446	I had to put a aftermarket pump by my resevior to get it to pump,I did the same as you with no luck __________________ 2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327

06-23-2005, 01:37 PM	#5
Robert1970C20rstbukt Registered User Join Date: Jun 2004 Location: Beeville, Texas Posts: 1,943	The rubber seal on the "piston" inside the washer pump might be so dry rotted that it can't pull a vacuum. I had that happen to me with about 6 different pumps. __________________ RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck

06-23-2005, 01:43 PM	#6
chickenwing Lovin' Life in Miss.! Join Date: Mar 2004 Location: Puckett, Mississippi Posts: 1,937	If the pump actually works (wich I doubt) pull a line off of the nozzle and try it then. Nozzles get plugged. It's tough to find a good used washer pump. The re-build kits only come with the check valves and washers. The main problem with em is the lil cam lobe on the pump wears down and makes it VERY hard to actuate. I've figured out how to re curve the cam lobe. Next problem is the cylinder walls are usually gouged and water will leak past the piston into your cab. I have thrown away good money trying to figure out how to rebuild this pump cheaply. Played with later years/models looking for a good donor parts. Everything was trash. Best bets. Junk it. If you are stuck on factory (like me) go buy a new one. My non-delco one was $29.00. You have to get it from one of the Chevy truck vendors. the parts houses do not have a the mechanical one. If you don;t mined a generic solid-state pump, you can buy them everywhere for around $20. Edit: Trust me. It will be cheaper in the long run. __________________ The truck... you hear that? No really, you did hear that?!!! Last edited by chickenwing; 06-23-2005 at 01:45 PM.

06-23-2005, 12:57 PM	#3
Jakes-66-K10 Registered User Join Date: Aug 2004 Location: Idaho Posts: 640	Yeah, I can hear it trying to work. But no water flowing, I should be able to put my finger on the hose that leads into the washer reservoir and feel a vacuum right? Maybe I can try hooking an air compressor up to one end of the hoses, to tell if they are plugged up...



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