ls swap for a 75 k5 blazer

[lowrodderchev]

So I've read till my eyes hurt and read more. I'm learning there's alot of homework in this swap. So far I have a 2001 5.3/4l60e (180,000 miles)and a np241 case. If I'm correct I should do a 87 blazer tank, stock sending unit, walbro 255 pump with 33737 regulator. Miss anything?So should I do steel lines or braided? And I'm still confused about the radiator steam pressure. Any help is very appreciated. Thanx in advance

[foamypirate]

Originally Posted by lowrodderchev

So I've read till my eyes hurt and read more. I'm learning there's alot of homework in this swap. So far I have a 2001 5.3/4l60e (180,000 miles)and a np241 case. If I'm correct I should do a 87 blazer tank, stock sending unit, walbro 255 pump with 33737 regulator. Miss anything?So should I do steel lines or braided? And I'm still confused about the radiator steam pressure. Any help is very appreciated. Thanx in advance

I ran a hard line from the 33737 filter/reg up to the front of the truck, then a PTFE lined braided stainless line from there to the fuel rail. For the steam fitting, there are multiple options. I opted to drill and tap the water pump and run a 1/4 NPT to barb fitting to tie my steam line into. Others will say something like "but if you break down on the side of the road with a bad water pump, you can't replace it because you have to drill and tap." To me, if you are somewhere you can get a water pump to replace yours, you can find something to temporarily block the steam line, but that's just me.

Here's my fuel setup (on a crewcab, yours would MUCH shorter. )

[lowrodderchev]

yeah that looks good thank you. wouldn't happen to have any pix of your steam setup would you?

[izzy_Britton]

Subscribed!

I too would like to see the steam port on the back of the fuel pump. I actually pulled a spare pump off yesterday to attempt this exact thing.

I look forward to seeing this.

-Izzy

[ls1nova71]

Originally Posted by izzy_Britton

Subscribed!

I too would like to see the steam port on the back of the fuel pump.

Don't think I would hook it to the fuel pump!

Also, to the OP, If your engine is an 01, you will have a return style fuel rail and dont need the corvette fuel filter, just a regular filter will do.

[izzy_Britton]

Originally Posted by ls1nova71

Don't think I would hook it to the fuel pump!

Smart ass! It was late!

But your absolutely correct, probably wouldn't run very well either.

[mongocanfly]

Lowrodder here's how I did my steam line..also you can use the vette filter/reg with that engine just block the return port on the fuel rail..that's how I did mine. I also ran steel braid for all my fuel lines.

[solidaxel]

If your going to replace the rad you could get a 1/4" fitting placed in the tank and hook your steam line to the rad, or have one added to your existing rad!

[foamypirate]

Originally Posted by lowrodderchev

yeah that looks good thank you. wouldn't happen to have any pix of your steam setup would you?

I don't have it plumbed up quite yet, but I'll just be continuing the coolant path through the TB. So it will be Steam port -> TB -> barb fitting on water pump.

Here is the tapped pump (LS3 Camaro in this case), with the fitting installed:

[ls1nova71]

Originally Posted by mongocanfly

also you can use the vette filter/reg with that engine just block the return port on the fuel rail..that's how I did mine.

How did you block the return? What did you do about the fuel pressure regulator on the rail? Essentially you're dead heading 58psi of fuel in a hot engine compartment by blocking off a line, so you had better have one hell of a block on it, not like the old days when you could hose clamp a bolt in a piece of rubber hose. You definitely don't want fuel spraying all over a hot engine. And all this just to use an overpriced fuel filter...... Just doesn't make sense to me.

[mongocanfly]

Ls1 what I did on the return rail was put a 5/16 gm style pushlock that had a -an male fitting on it then put a -an cap on it..with the vette filter reg I have there is no need to run a return line. The vette reg bypasses back into the tank..holds about 55psi on fuel rail and dont leak.. this is the way they told me to do it when I was assembling mine. Got about 8000 miles on it with no issues

[mongocanfly]

Ls1 what I did on the return rail was put a 5/16 gm style pushlock that had a -an male fitting on it then put a -an cap on it..with the vette filter reg I have there is no need to run a return line. The vette reg bypasses back into the tank..holds about 55psi on fuel rail and dont leak.. this is the way they told me to do it when I was assembling mine.