How is everyone getting power to their dual walbros? It seems like a relay with 10 gauge wire from the battery is the way to go. When I searching about this topic someone said NOT to use the standard switching relays... starter relays I belive... because they were noisy and unreliable. So I looked into other types of relays. I am assuming the proper style to use is the solid state relay? I came accross a bunch but most seem to have AC current output. I only found one that could handle 40 amps with DC current output, but they were $50+ each.

How did you guys wire this setup? is a soild state relay the right way to go?

Thanks,
Chris

 

I would suggest using an external starter type relays...you can get them at any parts store, fairly priced, and handles loads of current OR go with a general high current relay like this http://cgi.ebay.com/ebaymotors/ws/eB...m=280067878146

 

Thanks for the link. I guess that would work for both the pumps. Although bosch makes quality parts, I would have liked to stay away from the mechanical style switch relay. I think these solid state relays are what I need, I just hate to spend 100$ on relays then find out they wont do the job.

Here is a link to the solid state relay
http://www.power-io.com/products/hdd.htm
has anyone had experience with them?

 

Amps output, continuous, with proper heat sink. so you gonna need a 109. dollar heat sink to go with it and 1.50 Inductive load protection diode -- recommended

so a total of 255.00

 

IMHO, the only good reasons to use a solid-state relay would be if you need a very high switching speed, or are worried about failure due to a lot of vibration. Solid-state relays are slightly less efficient (they act as a small resistor, providing less power to the device), and as you've seen they're not exactly cheap.

Just get an automotive relay (they'll be fine for the temps and vibration found in your car) , be sure it's rated for at least 1.5x the current that both fuel pumps (combined) should require. For instance, 2x 15A fuel pumps = 30A, Relay should be 1.5x30 =45A. For safety, use a relay rated for at least 45A. Use a smaller fuse, for instance 40A, so the fuse will pop before the relay is damaged. Make sure your wiring can handle at least 45A as well (8-10AWG, depending on the length of the wire).


50A automotive relays should be pretty easy to find. Starter relays are built for upwards of 60-80A, so that might be bulky and expensive.


-s-