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07-04-2020, 01:17 PM | #1 |
Senior Member
Join Date: Jan 2009
Location: Austin, TX
Posts: 1,079
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Walbro 450 with factory EFI hanger PSA
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.
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-- Josh Instagram: @americanmusc1e OLD SKOOL-- 1970 C10. 454/Th400/3.07 posi Build Thread FARM TRUCK----1949 Chevrolet 3800 Power Wagon Hauler Build Thread 1999 4wd OBS Tahoe - daily. DM me if you can't see photos i posted |
07-04-2020, 10:21 PM | #2 |
60-66 Nut
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Re: Walbro 450 with factory EFI hanger PSA
That could have been bad.......
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07-04-2020, 10:31 PM | #3 |
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Re: Walbro 450 with factory EFI hanger PSA
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.
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-- Josh Instagram: @americanmusc1e OLD SKOOL-- 1970 C10. 454/Th400/3.07 posi Build Thread FARM TRUCK----1949 Chevrolet 3800 Power Wagon Hauler Build Thread 1999 4wd OBS Tahoe - daily. DM me if you can't see photos i posted |
07-05-2020, 12:51 AM | #4 | |
BMW & ASE Master Certified
Join Date: Feb 2004
Location: Houston, Texas
Posts: 1,266
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Re: Walbro 450 with factory EFI hanger PSA
Quote:
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
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07-06-2020, 05:14 PM | #5 | |
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Re: Walbro 450 with factory EFI hanger PSA
Quote:
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-- Josh Instagram: @americanmusc1e OLD SKOOL-- 1970 C10. 454/Th400/3.07 posi Build Thread FARM TRUCK----1949 Chevrolet 3800 Power Wagon Hauler Build Thread 1999 4wd OBS Tahoe - daily. DM me if you can't see photos i posted |
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07-07-2020, 02:20 AM | #6 |
Senior Member
Join Date: Dec 1999
Location: Southern California
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Re: Walbro 450 with factory EFI hanger PSA
High amperage draw with the aftermarket pumps is only one reason I chose to use a factory PWM pump for my LS swap.
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Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746 |
07-07-2020, 10:02 PM | #7 | |
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Join Date: Jan 2009
Location: Austin, TX
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Re: Walbro 450 with factory EFI hanger PSA
Quote:
That's just fine until you have 80lb injectors to feed
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-- Josh Instagram: @americanmusc1e OLD SKOOL-- 1970 C10. 454/Th400/3.07 posi Build Thread FARM TRUCK----1949 Chevrolet 3800 Power Wagon Hauler Build Thread 1999 4wd OBS Tahoe - daily. DM me if you can't see photos i posted |
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07-10-2020, 03:35 AM | #8 |
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Re: Walbro 450 with factory EFI hanger PSA
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.
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Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746 |
07-10-2020, 01:34 PM | #9 | |
Senior Member
Join Date: Jan 2009
Location: Austin, TX
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Re: Walbro 450 with factory EFI hanger PSA
Quote:
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?
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-- Josh Instagram: @americanmusc1e OLD SKOOL-- 1970 C10. 454/Th400/3.07 posi Build Thread FARM TRUCK----1949 Chevrolet 3800 Power Wagon Hauler Build Thread 1999 4wd OBS Tahoe - daily. DM me if you can't see photos i posted |
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07-11-2020, 02:21 AM | #10 | |
Senior Member
Join Date: Dec 1999
Location: Southern California
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Re: Walbro 450 with factory EFI hanger PSA
Quote:
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Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746 |
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