OEM disappering!! - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**MikeB** · 07-28-2015, 11:03 PM

Speaking of AC Delco, here's a link to their parts catalog. It's a great reference.

http://parts-catalog.acdelco.com/cat...elco%20catalog

*gmachinz* · 07-30-2015, 12:59 PM

Fear not gentelman....I have something in the works with Pollak!

**hatzie** · 07-30-2015, 09:37 PM

Quote:

Originally Posted by 80Sierra3500

Hatzie. I apologize. I didn't see the second page of the thread you mentioned. The electrical drawing of inside the valve explains much.(although the limit switches aren't shown, just the catch diodes for when they open.) As I understand it, the valve only changes position when the polarity of the applied voltage changes. IOW, you can leave the power on to the valve and it won't draw any current after it has shifted to the new position and the limit switch opened. wilkin250r's idea of applying negative 12V to the power terminal is intriguing. It should work fine.

Another interesting tidbit: after looking at the sender switch inside the valve, it looks like it could be adapted to drive relays to power right and left in-tank pumps.

There's only one SPDT Limit switch for the fuel pump motor. It is shown. The diagram is re-drawn from the Pollack literature and blown up to properly show the details. The limit switch moves to select the diode that blocks current till the polarity is flipped again.

TBI fuel pumps??? Do it like GM did from 1987 on... Wye off the valves' D & E terminal wires to the fuel pump hot terminals. The stock TBI sender/fuel pump power connection is a 2 position Weatherpack and the sender/fuel pump. Setup as GM did... The active pump will have power and ground and the inactive pump will have two grounds. You'll need to sync the valve position to match the active fuel pump by connecting the correct hoses...

80Sierra3500 · 07-31-2015, 01:25 AM

Yep, sounds like a LOT of fun. I recently acquired an MFI 454 and 4L80E from Craigslist. I actually only wanted the 4 speed transb1t1chin' but I got the whole package for 12oo bucks. If it's not blown up or headed that way, i got such a deal I just gotta put that in my ol' square dually. I initially was planning on using an inline pump between the twin tank valve and the engine but at that truck's age the tanks need to be re-done or replaced anyway. I thought the best performing option a that point would be in-tank pumps. It hasn't been set in stone yet.
I don't yet know what the current rating of the switch in the tank valve is nor do I know what those high pressure in tank pumps draw. Hence the relay suggestion. Sounds like a grand ol' time....

80Sierra3500 · 07-31-2015, 01:34 AM

It's annoying there's a limit to post editing. So I have to start a new post.

Interesting technique for the twin tank pumps. Looks like I'm gonna be having fun in the future.

Skunksmash · 07-31-2015, 02:06 PM

Quote:

Originally Posted by gmachinz

Fear not gentelman....I have something in the works with Pollak!

I know little of Pollak. Are they known for top quality?

*gmachinz* · 07-31-2015, 03:51 PM

They were the original supplier of a lot of electrically operated dual purpose valves-they supplied GM, Ford and others with the dual tank splitting valves. They may be getting obsolete through GM (I don't know if in fact they so make the "knock-off GM" aftermarket valves) but they would be just as good as buying NOS GM. Possibly cheaper too-I remember when ROH wheels out of Canada made the first several sets of prototype wheels for the upcoming 1994 Impala SS at GM's specs, then GM opted to outsource them for cheaper from another wheel company. ROH came out with their "Snyper" series wheels which were essentially the same GM wheel without an Impala logo on the center cap and no GM part number. So it was considered a knock-off GM wheel of sorts lol. GM at the time was about $550 per wheel and a set of 4 Snyper wheels were $550/set delivered to my door from Canada!

So in summary, Pollak valves are every bit as reliable as a genuine GM USA made part.

Tom · 07-31-2015, 06:19 PM

Hasn't Delphi been the main parts supply for GM for a while now? Meaning delco is people remembering the past. I know fuel pumps are delphi stock....

Skunksmash · 08-01-2015, 09:29 AM

Quote:

Originally Posted by Tom

Hasn't Delphi been the main parts supply for GM for a while now? Meaning delco is people remembering the past. I know fuel pumps are delphi stock....

Is that the label though? Or do they just slap ACdelco on delphi parts?

07-28-2015, 11:03 PM	#26
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,484	Re: OEM disappering!! Speaking of AC Delco, here's a link to their parts catalog. It's a great reference. http://parts-catalog.acdelco.com/cat...elco%20catalog __________________ Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!

07-30-2015, 12:59 PM	#27
gmachinz Account Suspended Join Date: Jun 2011 Location: Des Moines, IA. Posts: 4,143	Re: OEM disappering!! Fear not gentelman....I have something in the works with Pollak!

07-31-2015, 01:25 AM	#29
80Sierra3500 Registered User Join Date: Jul 2015 Location: Phoenix, AZ Posts: 15	Re: OEM disappering!! Yep, sounds like a LOT of fun. I recently acquired an MFI 454 and 4L80E from Craigslist. I actually only wanted the 4 speed transb1t1chin' but I got the whole package for 12oo bucks. If it's not blown up or headed that way, i got such a deal I just gotta put that in my ol' square dually. I initially was planning on using an inline pump between the twin tank valve and the engine but at that truck's age the tanks need to be re-done or replaced anyway. I thought the best performing option a that point would be in-tank pumps. It hasn't been set in stone yet. I don't yet know what the current rating of the switch in the tank valve is nor do I know what those high pressure in tank pumps draw. Hence the relay suggestion. Sounds like a grand ol' time....

07-31-2015, 01:34 AM	#30
80Sierra3500 Registered User Join Date: Jul 2015 Location: Phoenix, AZ Posts: 15	Re: OEM disappering!! It's annoying there's a limit to post editing. So I have to start a new post. Interesting technique for the twin tank pumps. Looks like I'm gonna be having fun in the future.

07-31-2015, 03:51 PM	#32
gmachinz Account Suspended Join Date: Jun 2011 Location: Des Moines, IA. Posts: 4,143	Re: OEM disappering!! They were the original supplier of a lot of electrically operated dual purpose valves-they supplied GM, Ford and others with the dual tank splitting valves. They may be getting obsolete through GM (I don't know if in fact they so make the "knock-off GM" aftermarket valves) but they would be just as good as buying NOS GM. Possibly cheaper too-I remember when ROH wheels out of Canada made the first several sets of prototype wheels for the upcoming 1994 Impala SS at GM's specs, then GM opted to outsource them for cheaper from another wheel company. ROH came out with their "Snyper" series wheels which were essentially the same GM wheel without an Impala logo on the center cap and no GM part number. So it was considered a knock-off GM wheel of sorts lol. GM at the time was about $550 per wheel and a set of 4 Snyper wheels were $550/set delivered to my door from Canada! So in summary, Pollak valves are every bit as reliable as a genuine GM USA made part.

07-31-2015, 06:19 PM	#33
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,717	Re: OEM disappering!! Hasn't Delphi been the main parts supply for GM for a while now? Meaning delco is people remembering the past. I know fuel pumps are delphi stock.... __________________ -78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me.



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