Walbro 450 with factory EFI hanger PSA

[americanmusc1e]

I posted this in the sloppy mechanics private FB group, but I wanted to put this here as a PSA.

My turbo LS C10 has a Walbro 450 in a factory 88 EFI blazer tank. The pump is on the stock hanger and 25a fuse, 12ga wire/relay to the sending unit. I lost all fuel pressure the other day. Turns out the pump is fine, but the factory bulkhead connector nearly caught on fire. I was thinking about redoing the tank setup anyway, but just a PSA that the Walbro pump (or any moderate/big HP pump) may draw more amperage than ANY factory wiring can handle.

[Captainfab]

That could have been bad.......

[americanmusc1e]

Originally Posted by Captainfab

That could have been bad.......

Yeah I'm not a fan of sketchy wiring heating up inside my fuel tank. That's why I posted. To hopefully save someone else from burning their truck down.

[87chevy.com]

Originally Posted by americanmusc1e

I posted this in the sloppy mechanics private FB group, but I wanted to put this here as a PSA.

My turbo LS C10 has a Walbro 450 in a factory 88 EFI blazer tank. The pump is on the stock hanger and 25a fuse, 12ga wire/relay to the sending unit. I lost all fuel pressure the other day. Turns out the pump is fine, but the factory bulkhead connector nearly caught on fire. I was thinking about redoing the tank setup anyway, but just a PSA that the Walbro pump (or any moderate/big HP pump) may draw more amperage than ANY factory wiring can handle.

It's as simple as not knowing. Not knowing what the capacity of that terminal can handle which is 14a and the current draw of a 450 which can be found easily.

Which is why I made these hats, fits stock tanks, proper terminal rated for 30a





A closer shot of the roll over valve.. cheap mild steel ball got replaced

[americanmusc1e]

Originally Posted by 87chevy.com

It's as simple as not knowing. Not knowing what the capacity of that terminal can handle which is 14a and the current draw of a 450 which can be found easily.

Which is why I made these hats, fits stock tanks, proper terminal rated for 30a





A closer shot of the roll over valve.. cheap mild steel ball got replaced

Those look nice! I would be contacting you for one except the 88 tank sticks past the end of my framerails now that my truck is SWB. I figured this was a good time to upgrade the tank, and went with an aluminum replacement tank.

[Richard]

High amperage draw with the aftermarket pumps is only one reason I chose to use a factory PWM pump for my LS swap.

[americanmusc1e]

Originally Posted by Richard

High amperage draw with the aftermarket pumps is only one reason I chose to use a factory PWM pump for my LS swap.

That's just fine until you have 80lb injectors to feed

[Richard]

I do not have a race car. The guy at Vaporworx has said that the CTS-V pumps will handle 80 lb injectors with his controller and dual pumps will do over 1000 hp.

[americanmusc1e]

Originally Posted by Richard

I do not have a race car. The guy at Vaporworx has said that the CTS-V pumps will handle 80 lb injectors with his controller and dual pumps will do over 1000 hp.

Interesting. I didn't realize you were LSA at first. I wonder what the amp draw is on that pump? PWM probably does help.

A quick google search says the factory CTS-V uses dual bosch pumps with around a 20A draw at 60PSI. According to 87chevy that is still more than my factory 80's blazer wiring bulkhead will do. Although it's less than the 25+ continuous amps of the Walbro 450.

What kind of tank are you using?

[Richard]

Originally Posted by americanmusc1e

Interesting. I didn't realize you were LSA at first. I wonder what the amp draw is on that pump? PWM probably does help.

A quick google search says the factory CTS-V uses dual bosch pumps with around a 20A draw at 60PSI. According to 87chevy that is still more than my factory 80's blazer wiring bulkhead will do. Although it's less than the 25+ continuous amps of the Walbro 450.

What kind of tank are you using?

Using a modified 90 Blazer tank. Carl the owner of Vaporworx is local to me. Has a ton of knowledge regarding fuel systems and obviously knows a lot about his product. Good info on his website and I found several threads he has contributed to in my search of a fuel system for my LSA swap. Benefits of stock type PWM (what I have gathered from him) Pump has built in reservoir so no need for baffled tank, single fuel line to motor. Less amp draw, maybe not at full throttle with dual CTS-V pumps. But for a driver, idle and cruising can be half or less. An aftermarket return type system running at full tilt all the time will heat up the fuel. Pump will last longer due to not running at full tilt 100% of the time. Fuel delivery can be metered by pressure or map. Not intending to promote his stuff. Just pass on info. I paid full price for his product. He is a super nice guy as well.