blow through fuel pump problem???

[nos81bu]

im running a weldon fuel injected pump and i have fuel delivery problems..the car evertime comes out of the gate hard and falls flat on its face and does it sometimes going down the track..flat on its face then recovers

I dont see any other issues that would cause this

i did go 9.00@156 with this issue it also get lean as hell as rpm increases

any help thanx
paul

[Blown84]

What regulator are you running, and what pump??

[nos81bu]

weldon 2345a and aeromotive 13202 regulator

[nos81bu]

What regulator are you running, and what pump??

weldon 2345a aeromotive 13202

[Blown84]

hmm thats the same stuff i'm running, and i ran into the same problem with the car coming out like a bear and then nosing over and going dead lean...what carb are u running?? duel needles or single??

[nos81bu]

same exact stuff with a blowthrough?

im running a csu carb and single needle and seats 140 bottom feed

i think the pump does not have enough volume

what did u find?

[Blown84]

well here goes..I have or had a CSU carb on my car with 160 bottom feed needles. the car on the dyno would run lean at about 5,800rpms and i could never get it to fatten up. I even pulled the rear jets out of the secondarys to see if it went lean..but funny at the same rpm at 5800 the car made 150 more horse to the tire and still went lean. i cant believe how much fuel the thing is asking for. My car is a bbc blow-through with an f2 and 28pounds of boost. it made 1250 rwhp at 6500 going lean and blowing the hat off the carb from a lean pop. So i now just took the big plunge and went injected and intercooled and waiting to see how that goes. but trust me i'm having or had the same problems and you..for my second year in a row. I do think my carb would work great on a smaller cubic inch motor cause i just cant get enough fuel to that 548 and 28 pounds of boost. tell me about your combo and simular problems. my carb is a duel needle and seat CSU carb.

[kiva565]

YOU MEAN DADDY TOOK THE PLUNGE WHEN YOU WENT INJECTED

[nos81bu]

man this is incredible for u to have the same exact issues as i have with the same fuel pump and boost...

now this just proves the weldon pump just dont have the volume 230gph to feed a blowthrough...

all i did last nite was put a magnafuel 500 on the car and the base fuel pressure alone jumped 3 psi

took it on the highway and the afr never got over 12.1 stayed 11.4 to 12.1 never did that before

u should try a magnafuel 500 before u spend all that money

now all i got to do is take it to the track too see if im not imagining

lol

give me a call we can talk 203-565-1959 paul

[nos81bu]

im running single 140 bottom feeds..i want to upgrade to duel needles though

[Blown84]

well paul u can always buy my duel needle and seat carb:) I'll give u a shout this weekend!

Thanks,Dave

[GARYB69Z]

the car coming out like a bear ... I MUST OF MISSED THAT ONE CAUSE ALL I SAW WAS IT COMING OUT LIKE A SNAIL

[DOTracer]

Paul, Are you sure it doesn't need the dual needle & seat bowls instead of more pump? With as much fuel as it's drawing, it sounds like one needle/seat is like sucking through a straw being the smallest restriction in the fuel system.

I was at Cecil a few weeks back when Ron Rhodes was testing a customers car. It's a 434 sbc with a blow thru supercharger and I noticed that carb had the dual needle & seat bowls. Car ran 8.30's and made it look effortless.

http://www.rhodescustomauto.com/Mitch4.jpg

[nos81bu]

ya i heard about that car its a similar combo to mine but he runs an a/w intercooler that helps make more power

i heard he was running 8.50s without an intercooler....i am going to upgrade my carb or buy daves....

my car should go as fast as that nova once i get this gremlin out............................................... ....... this winter im adding the intercooler too

[DOTracer]

Get ready to go BALD Paul from pulling your hair out :p . Ron admitted they have had a terrible time this season with the car tuning out gremlins. After their second or third pass they were loading up and I saw the blower belt hanging on the trailer door with no teeth and fibers hanging out :eek: .

But when it all comes together, them things do fly!

[nos81bu]

yes blowthroughs are not easy to tune but once u find the sweet spot u better hang on cause your going for a ride

i went 9.00@156 at 3500lbs with a 14.1 afr and leaving soft with low boost

[Eddie Wilson]

I am in the process of getting ready to buy a fuel system for my blow thru build. How about a Product engineering fuel pump? I think Powski runs a Product Engineering pump and regulator. I only want to spend the $$$ once! I will be running a dual needle and seat carb from CSU.

[Pooch565]

I have had my Product Engineering 460 combo for 3 years and it is flawless. I used to run a deadhead regulator and with a 16 volt battery it would run a constant 48 psi. I went to a C&S bypass reg. and it is great. I run a C&S Aerosol Billet carb with dual needle bowls and it has been flawless also.

I wouldn't be afraid of the PE. It is a great pump.

Jason


Oh I've been 8.80's at 160 with my non intercooled BBC with an F2 at 3500lbs on 28 by 10 slicks and stock suspension.

[nos81bu]

i think the PE pump and the magnafuel 500 are very close to being the same...

i think a huge jump for a blowthrough would be going to 16 volt to get the pressure up on thses pumps

im going to go to 16v this winter

[nos81bu]

i bought his duel needle carb today that should help also

[Jim Craig]

Paul,
Whatever happened with your test -- I hope that it worked out.

[nos81bu]

Paul,
Whatever happened with your test -- I hope that it worked out.
only change i made was take the weldon 2345a pump and and replace it with a magnafuel500....

my base fuel pressure increased 3psi...

and on a test pass on the highway the car did not get lean afr stayed between 11.4 -12.0 at wot in high gear..first time it ever did that

now i will take it to the track next week and see what happens

no doubt the weldon pump is killer but a" FI pump" NOT a "blowthrough CARB pump"

[Moparchris440]

Well the formula for figuring out fuel demand for a given motor is: for gasoline .5lbs of fuel for every hp per hour @wot for alk its 1.2 lbs per hour

[Moparchris440]

I am in the process of getting ready to buy a fuel system for my blow thru build. How about a Product engineering fuel pump? I think Powski runs a Product Engineering pump and regulator. I only want to spend the $$$ once! I will be running a dual needle and seat carb from CSU.
I have a complete PE system for sale its 3 months old ill sell it cheap , went t oalk so need a mechincal call me chris 586-615-5225

[Eddie Wilson]

Chris,
I want it! I will PM you!
EWW

[beaumont67nonos]

just food for thought have holly dominator series 250gph pump
brand new out of the box. ran it did the same thing, turned out the pump was actually kicking off and on.
pump was defective exchanged it for a new one , problem solved.
i run n/a with 1050 dominator so don,t know if it helps good luck.

[Dan Neumann]

My customer, Will Stevenson just recently ran 5.23@139 on the 1/8th on 295 M/T Drag Radials at 3490lbs. It's a 510ci BBC, F2 Procharger/Blowthru. He runs a CSU carb with the dual needle/seat bowls and a Magnafuel 500 pump. He runs a Product Engineering regulator that is boost referenced off the bonnet. We've never had a problem with a lean condition, ever.

[nos81bu]

My customer, Will Stevenson just recently ran 5.23@139 on the 1/8th on 295 M/T Drag Radials at 3490lbs. It's a 510ci BBC, F2 Procharger/Blowthru. He runs a CSU carb with the dual needle/seat bowls and a Magnafuel 500 pump. He runs a Product Engineering regulator that is boost referenced off the bonnet. We've never had a problem with a lean condition, ever.
nice how much boost?

[Dan Neumann]

nice how much boost?

He's currently running 24lbs of boost. He's actually had to jet the carb down a little as it was too rich right from CSU for his application.

[Eddie Wilson]

Dan,
I have a few questions about the fuel system on Wil Stevensons car. Does he have a return line from the regulator? Or return line at the fuel pump? Both? Also what size fuel lines is he running?
What ignition system is being used?
Thanks for any information.
Eddie Wilson

[Dan Neumann]

He's bypassing right from the pump like required with that pump and he's also bleeding off the regulator from both the high and low pressure sides. He's using the Product Engineering bypass system for that application. If you look closely at the picture above you can see a y-block where the two small bleed lines feed into the Y and back to the fuel cell.

[nos81bu]

proof again..i ran 8.7@158.9 at atco last nite and my AFR stayed between 11.4-11.8 the whole entire pass...car is really coming around

its an 81 malibu ,f2 blowthrough,sbc,non intercooled,3500lbs on radials

[JOE68]

If you guys dont mind me asking. What kind of ignitions are you running with these?

[Pooch565]

I never had a problem with my PE regulator either. My only beef was this. My pump was running at 46 psi at all times. It would get smoking hot and was pulling a ton of amps. I went to a C&S bypass and it runs at 9 psi until I wack it and the boost comes up. Other than that, the PE stuff is great.


Jason

PS what kind of car is will's? Just curious cause we have almost the same combo and weight, but I'm non intercooled and a 565 bbc.


Phuck, I didn't realize there was a 3rd page. Anyway, I run a 7530T box with an MSD distributor, the big red coil for the 7 series, msd wires and NGK plugs

[Moparchris440]

I have 2 -4 port PE regulators and a complete by pass system with the jets y block and lines does anybody need it let me know Chris 586-615-5225

[JOE68]

thank you very much Pooch565. I have been looking for awhile now into building a procharger motor and I have been just slowly trying to read up and learn more about them... I am changing from a N.O.S. motor and dont want to make the move until i know more.

[Eddie Wilson]

Pooch565 Are you running Alky or gas? What regulator part # are you using?

[ZERO260IN1]

TIH

[nos81bu]

call ptc for a converter thats what i have leaves really hard...its a 9.5" about 5500stall

[Pooch565]

Eddie,

I'm running non intercooled on VP C16.

[ZERO260IN1]

TIH

[nos81bu]

I read an old post of yours saying yours was a slug out of the hole too. What stall did you have in it back then? Was that the problem?


Thanks
i had a tight 10" nos converter stalled about 3500 at its best...was a dog down there..1.69 60 foots to 1.33 ...but it was fat also but the converter was part of it

i have a brand new xtra converter for sale if interested..for turbo application or glide with turbo spline

[ZERO260IN1]

TIH

[nos81bu]

What size of converter? And what brand?


So how much boost are you running on your F2 now?


Thanks
ultimATE CONVERTER CONCEPTS 10"for blower application approx 4500-5000 stall
new in box
never used
22lbs of boost

[Eddie Wilson]

81Malibu, Pooch,
I got a question for yall. What system do yall use to read AF Ratios? Innovate? Do yall read exaust temps? Air inlet temp? I was wondering if these temps are any value during tuning? Also, what ignition box? I am running a turbo set up, but i figure Blow thru is blow thru!
I am running a 101mm with a 400+ ci 14 degree aluminum heads. The motor at 400 ci before the turbo made 800+ hp N/A. I would like to make good power at lower boost levels.

[nos81bu]

i use the innovate for afr and it logs rpm..works mint
i use an msd 7531 prog box that works awesome too,with the map sensor

i want to get egts and inlet temp for next year to help on a better tune

[Eddie Wilson]

Paul, which innovate do you use? LM1 with aux box?

[nos81bu]

Paul, which innovate do you use? LM1 with aux box?
the one with the rpm module..its the middle of the pack one was like 349