new build needing fuel system ideas.
new build needing fuel system ideas. well in the last 2 months or so we put together a rcsb 2003 Silverado for my brothers summer hot rod/ daily when the weather is nice. used one of my 187.000 mile lq4 engines just added blue ls6 valve springs and ran it.
on3 turbo kit with 78/75 turbo,400 th trans with 3000 stall and 342 gears. everything works good . running on a microsquirt with a pumpgas tune.
this is the issue we are running the stock pump return style with a aem 380 pump in line as well. the system works ok but we noticed at 12 # boost it was running out of fuel we did make it to the track to mess with tune and after that test we backed it down to 8# and ran 12.05 the next pass and went to 10# the next pass and ran 11.77 at 118 mph but the first test pass was the fastest 1/8 being a 7.35 at 95 mph but he seen the wideband jumping at 1/2 track and lifted..
well as usual he wants a little more so we feel the best way is to go e85. wich leads me to the question I want a fuel system that can be ran everyday and make say 700whp on e85 but here is the kicker I don't want to add a pump to the stock hanger that starves the engine when it is under 1/2 a tank from sloshing. being the long flat bottom tanks need the stock style pump to keep the pump hanger full.
this is what im thinking a 255 pump drop in hanger style pump running all the time and add a sump or bulkhead fitting to the rear of the tank and run a second pump off a hobb switch that runs under boost when the fuel is in the rear of the tank . and see how that works.
anyone with a different idea please lets here it. thanks.
on3 turbo kit with 78/75 turbo,400 th trans with 3000 stall and 342 gears. everything works good . running on a microsquirt with a pumpgas tune.
this is the issue we are running the stock pump return style with a aem 380 pump in line as well. the system works ok but we noticed at 12 # boost it was running out of fuel we did make it to the track to mess with tune and after that test we backed it down to 8# and ran 12.05 the next pass and went to 10# the next pass and ran 11.77 at 118 mph but the first test pass was the fastest 1/8 being a 7.35 at 95 mph but he seen the wideband jumping at 1/2 track and lifted..
well as usual he wants a little more so we feel the best way is to go e85. wich leads me to the question I want a fuel system that can be ran everyday and make say 700whp on e85 but here is the kicker I don't want to add a pump to the stock hanger that starves the engine when it is under 1/2 a tank from sloshing. being the long flat bottom tanks need the stock style pump to keep the pump hanger full.
this is what im thinking a 255 pump drop in hanger style pump running all the time and add a sump or bulkhead fitting to the rear of the tank and run a second pump off a hobb switch that runs under boost when the fuel is in the rear of the tank . and see how that works.
anyone with a different idea please lets here it. thanks.
Easiest way will probably be to run a fresh feed line and use the old feed as a return
Use a boost referenced fuel pressure regulator
I used the twin 340s from racetronix using the stock bucket, with a bulkhead connector on the top for a new feed line
Their dual pump setup has a billet yblock so no need for hose clamps and harbor freight fittings...lol
Simple install, and supported mid 700s on e85 with no issue
Use a boost referenced fuel pressure regulator
I used the twin 340s from racetronix using the stock bucket, with a bulkhead connector on the top for a new feed line
Their dual pump setup has a billet yblock so no need for hose clamps and harbor freight fittings...lol
Simple install, and supported mid 700s on e85 with no issue
http://www.racetronix.biz/itemdesc.a...PA-680&eq=&Tp=
Hard to beat an intank setup good for a bunch of power for 250 bucks
Hard to beat an intank setup good for a bunch of power for 250 bucks
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Joined: Nov 2003
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From: Norn Iron
And why would you think a mechanical pump wouldnt heat the fuel any more/less than an electric pump ? When the reality is only a very very minimal amount of heat comes from an electric pump.
Originally Posted by mkvamso
http://www.racetronix.biz/itemdesc.a...PA-680&eq=&Tp=
Hard to beat an intank setup good for a bunch of power for 250 bucks
Hard to beat an intank setup good for a bunch of power for 250 bucks
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
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From: Ohio
I would go the dual pump and surge tank route. You can get a 1 gallon surge for 50 bucks on eBay. Instead of dual 044s or 340s that'll eventually have e85 issues, use a pair of AEM 320lph E85 specific pumps.
thanks for the replys. that sock in the video is awesome. that is the general idea.
its not that we want to run low on fuel. we just don't want to have an issue with air under full acceleration. when under 1/2 tank. like cutting the basket and adding a bigger pump whould in a long tank without good baffeling.
just want to do it once and have it work as good as it works now just good enuff for e85 and a few more # boost.
its not that we want to run low on fuel. we just don't want to have an issue with air under full acceleration. when under 1/2 tank. like cutting the basket and adding a bigger pump whould in a long tank without good baffeling.
just want to do it once and have it work as good as it works now just good enuff for e85 and a few more # boost.
I daily drove my twin turbo gto and made about a hundred passes in it this year
Zero issues with the intank dual 340s on e85
Ive ran it til the low fuel light was on, never had a problem with slosh or heating the pumps up with low fuel.
Surge tanks and internal pump feeding dual external pumps is added complexity you dont need
Zero issues with the intank dual 340s on e85
Ive ran it til the low fuel light was on, never had a problem with slosh or heating the pumps up with low fuel.
Surge tanks and internal pump feeding dual external pumps is added complexity you dont need
I think the issue is the tank design the tank is flat on the inside and uses an outlet on the top of the pump to keep the fuel pump hanger/bucket full of fuel even when the tank is low there is 5" fuel at the pump sock. so it stays submerged. and from what I see on line if you add or cut the hanger and add bigger pumps you need to keep 1/2 tank or more to keep it working under power. and with a 4200 lb truck an extra 100 lb fuel is not helping the weight issue.
I bet the fancy sock will cost alot more than a $35 surge tank that would also solve your issues. Use the stock in tank pump you have now to fill the surge. You're not going to drain the surge tank on one pull. The fuel will slosh back in the tank after the pull and fill the surge. You'll be fine.
