Weber draw through fuel system help

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advinnie
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Weber draw through fuel system help

Post by advinnie » Thu Aug 31, 2017 7:01 am

Hi all I've decided this time to try a draw through turbo set up on my 1600 bug cause I've never done one before just blow through set ups, any way need help with the furling side of things. Now I now the Weber need around 2psi of pressure to run good and unlike a blow through system I do t need a boost sensitive fuel pressure regulator ( am I right?)
So do I just set the fuel pressure using my filter king regulator to 2 psi and that's it? If so I'm guessing I could use the stock fuel pump?
I'm only planning on 8-10 psi of boost
Many thanks

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seabeebuggy
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Re: Weber draw through fuel system help

Post by seabeebuggy » Mon Sep 18, 2017 11:45 pm

It is still better to have a boost reference. your fuel use goes up fast but unlike Blow through you are not fighting the boost pressure. run the 2lbs if that is required but have it boost up to 5 or 6 lbs under boost. Never want to go lean and if I remember correctly the Draw through carbs have a smaller fuel bowl and that is why it is better to still give it a limited boost of fuel.

advinnie
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Re: Weber draw through fuel system help

Post by advinnie » Tue Sep 19, 2017 12:43 am

IMG_0542.PNG
At last I've managed to post a photo 😁 Thanks for that
I do now have a boost sensitive fuel pressure regulator as well
You do not have the required permissions to view the files attached to this post.

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seabeebuggy
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Re: Weber draw through fuel system help

Post by seabeebuggy » Tue Sep 19, 2017 11:09 pm

looks good.

advinnie
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Re: Weber draw through fuel system help

Post by advinnie » Wed Sep 20, 2017 12:38 am

Thanks mate. Just need the fuel pump to turn up now I ended up buying it from from a small place many many miles away called America 😁 Cause it was cheaper to buy there than in the UK 😑. £200 if I brought from the uk or £130 total if I brought from America

madmike
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Re: Weber draw through fuel system help

Post by madmike » Wed Sep 20, 2017 6:35 am

what brand pump?

advinnie
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Re: Weber draw through fuel system help

Post by advinnie » Wed Sep 20, 2017 7:53 am

Holley red

madmike
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Re: Weber draw through fuel system help

Post by madmike » Thu Sep 21, 2017 5:07 am

Perfeck :wink: :lol:

advinnie
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Re: Weber draw through fuel system help

Post by advinnie » Thu Sep 21, 2017 6:15 am

Just found out that I should have a check valve on the turbo boost line going to the fuel pressure regulator does anyone have a link to what type I need?

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seabeebuggy
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Re: Weber draw through fuel system help

Post by seabeebuggy » Sat Sep 23, 2017 10:36 pm

advinnie wrote: ↑
Thu Sep 21, 2017 6:15 am
Just found out that I should have a check valve on the turbo boost line going to the fuel pressure regulator does anyone have a link to what type I need?
I don't see why. I have a Blow through but the boost reg is the same.

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brookester
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Re: Weber draw through fuel system help

Post by brookester » Wed Sep 27, 2017 11:03 pm

You don't need the check valve , but you do need the boost sensitive fpr.

advinnie
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Re: Weber draw through fuel system help

Post by advinnie » Thu Sep 28, 2017 12:36 am

Ok the only reason I've asked is because some people are saying that on a draw through set up the boost sensitive fuel pressure regulator will see a high vacuum as well as boost and the regulator will break?

gbaker770
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Re: Weber draw through fuel system help

Post by gbaker770 » Wed Oct 11, 2017 9:06 pm

Wont break it, but will suck it shut. Put a check valve in it and problem solved.

gbaker770
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Re: Weber draw through fuel system help

Post by gbaker770 » Wed Oct 11, 2017 9:08 pm

I think its a 2 or 3 psi check valve. Car Craft sells them. Some motors make more vacuum than others at idle.

richardcraineum
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Re: Weber draw through fuel system help

Post by richardcraineum » Sun Nov 19, 2017 8:25 pm

u don't need to raise fuel pressure on a draw through, been running one for about 3 yrs now about 13 lbs of boost with 3lbs fuel pressure. I'm no scientist but remember the law of fluid dynamics, pressure goes up and volume goes down. the only reason to increase fuel pressure in a blowthrough is so that the boost doesn't go higher than fuel pressure and push fuel backwards out of the fuel bowl , not an issue on draw through
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