i used a remote fuel pressuer gauge to test my l05 out today and it holds at 12.5 at idle but as soon as i put a load on it, blip the gas or any thing it drops to 10.
what do you think is up with it

 

A. final answer. The stock TBI pump cannot even pump enough fluid to put out a candle.

 

so i should pbly go get a new fuel pump any sugestions i only run need about 13 psi at wot and i do not want to have problems with the return setup keeping up

 

You need way more than 13 psi at WOT. Even a stock LO3 needs about 15 PSI at WOT. Just get a high flow unit now so that when you add some more mods you will never be fuel deprived. Check out the Walbro units.

 

i heard that people where having probs with the 255 units in that the return was not able to keep up and then they would be stuck with 15 16 and even presure over 19 at idle that is why i am so woried about going with a hi flow pump

 

try a 190 pump

 

I would be willing to bet that the return line is not the issue but the passage in the throttle body just being to small. Now I haven't looked at it lately but if it can be inlarged for more flow the i think the bigger pump would work ok.

Steve

 

any one have the part #for the 190 lph pump that will work for the tbi

 

Type in "Walbro fuel pump" in a search engine and you should get like 70 places that sell it. Prices vary but I have seen it as low as $115.

 

thunder racing at the top of the page sells it

 

http://www.autoperformanceengineering.com/

sells them...
190 ltr/hr kit


-FPG001 - $83
a.k.a. GCA701


The 190 ltr/hr pump kit has been installed in many TBI cars and trucks with excellent results. The fuel pressure regulator on the TBI engines appear to be large enough to return all the extra fuel to the tank.

 

thank you very much

 

update to all that said fuel pump you where right. i got the walbro 190 and i now it holds at 15 psi will drop about 1/4 a psi when i wack it but thats it. i am going to the track friday to see if this thing runs much better