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Re: [GMCnet] Need a GOOD relay to run my two fuel pumps. As my new China one just quit. [message #323639 is a reply to message #323603] |
Sat, 09 September 2017 11:19 |
Ken Burton
Messages: 10030 Registered: January 2004 Location: Hebron, Indiana
Karma: 10
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Just about any 12 volt relay will do. A fuel pump is a low current device. It does not have any high current start up requirements. My Cater P4070 draws less than 2 amps. I have a 3 amp fuse in line with it and have never blown it. I'm not quite sure of your wiring set up, but you can always go to the junk yard and get a few relays out of GM vehicles (or other brands) and wire one up with some small push on connectors.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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Re: [GMCnet] Need a GOOD relay to run my two fuel pumps. As my new China one just quit. [message #323725 is a reply to message #323629] |
Sun, 10 September 2017 17:59 |
rvanwin
Messages: 325 Registered: April 2007 Location: Battlefield, MO
Karma: 6
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Bullitthead wrote on Sat, 09 September 2017 09:34If you are using 1 relay to drive 2 pumps, I would split the load and use another relay for each additional pump. Less communication of the power fluctuations generated by each pump that way and also makes troubleshooting much easier with each pump having a direct line to the battery.
The relay Bob is using (or hopefully is using) is a 5 pin. When the relay is not energized the 12v from the EFI (which should be triggered by a normal relay) goes into the 5 pin relay then out to the main tank pump. When the relay is energized by the selector switch (switching to Aux), then the relay will switch the 12v to the other lug which should be connected to the Aux. Pump.
Bob, is this the way you have wired your setup? I think this is what we have discussed as the best way to wire the main and aux pumps.
Randy & Margie
'77 Eleganza II '403'
Battlefield, MO
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Re: [GMCnet] Need a GOOD relay to run my two fuel pumps. As my new China one just quit. [message #323776 is a reply to message #323603] |
Mon, 11 September 2017 17:57 |
midlf
Messages: 2212 Registered: July 2007 Location: SE Wisc. (Palmyra)
Karma: 1
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BobDunahugh wrote on Fri, 08 September 2017 16:31 Put in another new fuel pump. Didn't even get out of the drive when the new relay died. This relay is a small black one from Auto Zone. Any suggestions? Bob Dunahugh
Get your failed one open. Bring it to Elkhart. I had one of these cube relays fail. I popped it open and found an itty bitty relay inside the case. No way was that relay good for 30/40 amps.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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Re: [GMCnet] Need a GOOD relay to run my two fuel pumps. As my new China one just quit. [message #323779 is a reply to message #323745] |
Mon, 11 September 2017 20:54 |
rvanwin
Messages: 325 Registered: April 2007 Location: Battlefield, MO
Karma: 6
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BobDunahugh wrote on Sun, 10 September 2017 23:26Randy. I did go with your suggestion with the 5 pin relay. Thank you. The pumps are running with about 4 Amps. The rely is rated at 40 Amps. I just love this setup. Should have installed that setup when I had the carb. And Randy. My idle in drive is now at 725 RPMs. Is that close enough to keep my TB happy? Bob Dunahugh One happy sucker.
Bob,
Yes, that idle should be good. When you get here to Elkhart, I can put a monitor on and we can do the final adjustment of idle to get it dialed in properly. I can also check your fueling parameters and make any additional tweaks that might help it run even better.
Randy & Margie
'77 Eleganza II '403'
Battlefield, MO
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Re: [GMCnet] Need a GOOD relay to run my two fuel pumps. As my new China one just quit. [message #323794 is a reply to message #323603] |
Tue, 12 September 2017 12:33 |
TR 1
Messages: 348 Registered: August 2015 Location: DFW
Karma: -7
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Mens mall is where I get relays. OEM relays are generally high quality, and they're like a buck or 2 at the pick n pull.
Bosch ones are ok... But I've replaced more than a few few on BMWs, Audis and VWs over the years... I prefer the Denso ones. I've been driving Mazda RX7s for 27 years now, and I currently own 4. None are my daily drivers anymore, but all have the original relays, and I've never replaced even one. Including my 85 which has 290K miles on it. Same goes for my friends with these cars. Heck, even my 74 Rotary Pickup, which I've owned for 10 years now, has all the original relays. However, the 74 has the old style with the metal caps and big copper coils that are more "serviceable" than the modern ones, but are heavy, and no better than the newer ones... at least, 30 years in they haven't proved to be so far.
Hard to beat 70s, 80s and 90s Japanese electronics for durability. Can't comment on the newer stuff, as it's still unproven, IMO.
FWIW, all modern GM vehicles I know of run Denso ignition components from the factory...
I have a whole box full of relays I've pulled off of Mazda's in JYs over the years. Used them on all sorts of projects... Lighting, electric fan setups, etc. I generally clip a nice section of the plug harness as well for splicing. When Mazda mounts a relay out in the elements, they generally include a rubber boot that goes over the relay and part of the harness as well. Nice to have if you also plan on mounting outside.
Like this:
http://www.ebay.com/itm/FA0151939-New-Genuine-Headlamp-Light-Retractor-Relay-OEM-For-1984-85-Mazda-RX-7-/182382442682?fits=Model%3ARX-7&hash=item2 a76d738ba:g:cscAAOSwo4pYSbvb&vxp=mtr
They're expensive if you buy them new, (which may be why they last so long)... But like a a couple bucks at the JY.
Mark S. '73 Painted Desert,
Manny 1 Ton Front End,
Howell Injection,
Leigh Harrison 4bag and Rear Brakes,
Fort Worth, TX
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