# What should I do with my fuel system? **URL:** \ **Category:** NYSpeed Automotive\ **Created:** [September 12, 2011, 5:28pm UTC](https://forums.speedlife.net/t/what-should-i-do-with-my-fuel-system/216438 "2011-09-12T17:28:02Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![juicedz4](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/juicedz4/32/5051_2.png) [@juicedz4](https://forums.speedlife.net/u/juicedz4)\ **Post date:** [September 12, 2011, 5:28pm UTC](https://forums.speedlife.net/t/what-should-i-do-with-my-fuel-system/216438/1 "2011-09-12T17:28:02Z")
After tuning the cavy I noticed my fuel pressure wasnt rising over 60psi, with 50psi base fuel pressure and 20psi. At first I assumed this to be b/c of low voltage as my alternator wasnt charging over 4k rpms. I replaced that and the fuel pressure wasnt miraculolusly fixed. After that didnt work I installed a spare inline Walbro up front between the hardline and the fuel rail. That fixed the issue, now fuel pressure tracks over 60psi, and right to 70 where it should. However, I really dont want to keep the hacked in inline pump forever and want a a “final” soluton. Originaly I was thinking I woud just leave the rear pump and build a surge tank to mount up front with twin walbros in that, feeding the rail via -8 (the rail is already -8, just with -6 fittings). The other option is to just put another Walbro in the tank on the stock lines (3/8" feed, 5/16" return). What Im not sure of is if the stock lines will be sufficient with dual wablros and the thought of running a new hardline for the feed isnt high up on my things Id really like to do list. Currently I make 330hp/315ftbls, but we were limited on fuel b/c of the pressure issues. Im shooting for 400whp. ![http://clubhousecustoms.com/gallery2/d/12445-1/21psi+peak+18Aug11.jpg](http://clubhousecustoms.com/gallery2/d/12445-1/21psi+peak+18Aug11.jpg) Lookin for opinions on what I should do… 1. Add second walbro in tank on the stock lines. 2. build surge tank with dual walbros and leave the current walbro to fill it. 3. ? Dan ---
**Author:** ![MPD47](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mpd47/32/7383_2.png) [@MPD47](https://forums.speedlife.net/u/MPD47)\ **Post date:** [September 12, 2011, 6:17pm UTC](https://forums.speedlife.net/t/what-should-i-do-with-my-fuel-system/216438/2 "2011-09-12T18:17:58Z")
Go completely overkill and buy my A1000? ---
**Author:** ![97FormulaWS-6](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/97formulaws-6/32/7384_2.png) [@97FormulaWS-6](https://forums.speedlife.net/u/97FormulaWS-6)\ **Post date:** [September 12, 2011, 6:39pm UTC](https://forums.speedlife.net/t/what-should-i-do-with-my-fuel-system/216438/3 "2011-09-12T18:39:03Z")
I dunno what size the stock fuel line is, but I know in F-bodies and Mustangs the stock fuel line supports dual in-tank Walbro’s; and this is done very often. ---
**Author:** ![Carnut](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/carnut/32/7590_2.png) [@Carnut](https://forums.speedlife.net/u/Carnut)\ **Post date:** [September 12, 2011, 8:48pm UTC](https://forums.speedlife.net/t/what-should-i-do-with-my-fuel-system/216438/4 "2011-09-12T20:48:03Z")
Have you rewired the fuel pump with larger gauge wire and relay? ---
**Author:** ![Saxon](https://avatars.discourse-cdn.com/v4/letter/s/59ef9b/32.png) [@Saxon](https://forums.speedlife.net/u/Saxon)\ **Post date:** [September 12, 2011, 9:02pm UTC](https://forums.speedlife.net/t/what-should-i-do-with-my-fuel-system/216438/5 "2011-09-12T21:02:21Z")
one in tank walbro is good for almost 600whp seems like something is wrong i would run a constant 14v to the fuel pump from the battery with a relay, the feed and return are definetly big enough i wouldnt say that an inline fuel pump is “hacked”, i know plenty of people who run a walbro in tank pump feeding a bosch inline pump with 600whp on e-85 ---
**Author:** ![ultradriver10000](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ultradriver10000/32/7397_2.png) [@ultradriver10000](https://forums.speedlife.net/u/ultradriver10000)\ **Post date:** [September 12, 2011, 9:29pm UTC](https://forums.speedlife.net/t/what-should-i-do-with-my-fuel-system/216438/6 "2011-09-12T21:29:55Z")
My trans am has an in tank walbro with an additional external pump and it works fine on stock lines. Built 408. I’d probably try to do dual in tank set up as it would seem to be the easiest. What advantage is a surge tank? Seems like overkill. ---
**Author:** ![juicedz4](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/juicedz4/32/5051_2.png) [@juicedz4](https://forums.speedlife.net/u/juicedz4)\ **Post date:** [September 13, 2011, 5:25am UTC](https://forums.speedlife.net/t/what-should-i-do-with-my-fuel-system/216438/7 "2011-09-13T05:25:08Z")
> [@Carnut](#): > > Have you rewired the fuel pump with larger gauge wire and relay? Yes. Could it be even better, probably. However, Im not convinced it would make any difference. After I fixed the alternator and gained almost 2.5V there was no improvement. Both the dash gauge and my data logs agree. > [@Saxon](#): > > one in tank walbro is good for almost 600whp > > seems like something is wrong > > i would run a constant 14v to the fuel pump from the battery with a relay, the feed and return are definetly big enough > > i wouldnt say that an inline fuel pump is “hacked”, i know plenty of people who run a walbro in tank pump feeding a bosch inline pump with 600whp on e-85 The pump could be on the way out. Its been in there for over 6 years (but has MUCH less than normal operation time.) Im not saying an inline pump is hack, but they way I have mine in there now is. I literally spent like 45mins plumbing it in and wiring the relay. Its less than up to my standards. I could just make it nice… > [@ultradriver10000](#): > > My trans am has an in tank walbro with an additional external pump and it works fine on stock lines. Built 408. > > I’d probably try to do dual in tank set up as it would seem to be the easiest. What advantage is a surge tank? Seems like overkill. The surge tank setup would give me: tons of headroom if I ever want to go back to corn power no need to upgrade the stock lines never have to worry about fuel starvation on low tank I acutally have almost all the fittings and hose etc “in stock” Id need to plumb it, lol Dan ---
**Author:** ![Studderin](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/studderin/32/7197_2.png) [@Studderin](https://forums.speedlife.net/u/Studderin)\ **Post date:** [September 13, 2011, 6:44am UTC](https://forums.speedlife.net/t/what-should-i-do-with-my-fuel-system/216438/8 "2011-09-13T06:44:24Z")
test the tank pump, that and the 3/8 line I think should do what you need.I dont know this stuff that well but worked on a lot of other cars fine. ---
**Author:** ![ultradriver10000](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ultradriver10000/32/7397_2.png) [@ultradriver10000](https://forums.speedlife.net/u/ultradriver10000)\ **Post date:** [September 13, 2011, 7:00am UTC](https://forums.speedlife.net/t/what-should-i-do-with-my-fuel-system/216438/9 "2011-09-13T07:00:28Z")
> [@juicedz4](#): > > The surge tank setup would give me: > tons of headroom if I ever want to go back to corn power > no need to upgrade the stock lines > never have to worry about fuel starvation on low tank > I acutally have almost all the fittings and hose etc “in stock” Id need to plumb it, lol > > Dan In that case I’d probably run a small surge tank up front. Running corn fuel and larger injectors down the road could net you more power right? 🙂 ---
**Author:** ![juicedz4](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/juicedz4/32/5051_2.png) [@juicedz4](https://forums.speedlife.net/u/juicedz4)\ **Post date:** [September 13, 2011, 7:06am UTC](https://forums.speedlife.net/t/what-should-i-do-with-my-fuel-system/216438/10 "2011-09-13T07:06:23Z")
It could net me more power, def. There is still power to be had on pump gas. Im near certain I can make close to 400 observed on Ricks Land and Sea on 93 oct. I was just out of injector before due to the shit fuel pressure. As of now, I think Im just going to do the dual in tank walbros. I can probably install and wire them in a night or two and be done. If someyear I go back to corn, Ill figure out what to do then, if I even need to do anything. Dan