Walbro 255 fuel pump?

[Tony Davila]

Okay I have given up searching this forum to see if anyone has tried using the 96 7.4 Suburban Walbro fuel pump in their Z. I have to now replace my secondary and was curious if anyone has tried that pump.

Lingenfelter has a Walbro twin replacement fuel pump assembly for our cars on his website. I was contemplating using a Walbro pump on my secondaries only because I didn't want to use another Airtec if possible.

Walbro F20000169 255LPH Fuel Pump Chevrolet Suburban 1996 - 1997

[DaveK]

No knowledge of them myself but there was a previous post about them:

http://www.zr1.net/forum/showthread....ghlight=walbro

Maybe the posters can provide more information.

Dave

[Tony Davila]

Originally Posted by DaveK

No knowledge of them myself but there was a previous post about them:

http://www.zr1.net/forum/showthread....ghlight=walbro

Maybe the posters can provide more information.

Dave

Thanks..... that is what I needed to know. I did Head and Cam work on engine and now every so often it falls flat after 7k. Pump pressure was 48psi on secondary. I might just do that swap.

Tony

[Pete]

Originally Posted by Tony Davila

Thanks..... that is what I needed to know. I did Head and Cam work on engine and now every so often it falls flat after 7k. Pump pressure was 48psi on secondary. I might just do that swap.

Tony

Let me take a wild guess,you installed Stage I cams?

Pete

[Tony Davila]

Originally Posted by Pete

Let me take a wild guess,you installed Stage I cams?

Pete

You have my curiosity..... Yes I do, okay.... what is up?
I forgot to mention my wideband A/F indicates lean during that time, like it is starving for fuel.

Tony

[Pete]

Been saying it, i've been SCREAMING it, nobody is listening.
You can lead a horse to water you can't make him drink.

EXHAUST CAMS ARE TOO BIG

We have 3 FBI 10 second Z's big motors, they all have smaller exhaust cams then your Stage I's.

This is about as far as i will go on this matter on here as much as i wanna say more,but i will get the boot.

After you add the fuel you will be told to do a ???????? i know what it is. Can anyone else guess.
I'm here for you to guess what's coming next for your Z.

Pete

PS
Tony,i don't mean to come off strong/harsh.
I know you spend some money.
Anybody that knows me knows if you ask me a question i will give you a straight answer,as a good friend of mine (wazoo guy) told me once i'm no salesman,i love him for being straight with me and i can not argue with the truth,he's right i'm no saleman.

I don't mean to come off harsh/strong if you say the word i will delete my post just say the word.

[DaveK]

Originally Posted by Pete

This is about as far as i will go on this matter on here as much as i wanna say more,but i will get the boot.

Where did this "freedom of speech but only if you agree with me or say nothing controversial" thing come from? I seem to see it far too often these days. Isn't the essence of democracy that we all have a right to state and debate our opinions?

Speak up Pete, if they ban you or something I'll put up the bail money! That said I don't believe anyone running the registry would have a problem with open and honest debate or discussion.

"I disapprove of what you say, but I will defend to the death your right to say it" - E.B. Hall, The Friends of Voltaire.

[XfireZ51]

Originally Posted by Tony Davila

You have my curiosity..... Yes I do, okay.... what is up?
I forgot to mention my wideband A/F indicates lean during that time, like it is starving for fuel.

Tony

Tony,

Does that mean your VE table is maxxed out at the top!!? Who did the tune?
Pete and I were just talking about Stage 1 cams and how really the LT-5 doesn't need more exhaust. Already pretty efficient and better breathing exhaust system makes it better. Bigger exhaust cam has too much overlap with valve closing late and taking some of the air/fuel charge out the exhaust port. FU told me once he believed the motor came "overcammed" from the factory and given the improvement we get with just porting, I agree with him. This is why I decided to onstall only a larger intake cam with my ported heads.

[RHanselman]

We put two Walbro's in the turbo car but I'll have to look back at the receipt to see which ones...

[Tony Davila]

Originally Posted by Pete

Been saying it, i've been SCREAMING it, nobody is listening.
You can lead a horse to water you can't make him drink.

EXHAUST CAMS ARE TOO BIG

We have 3 FBI 10 second Z's big motors, they all have smaller exhaust cams then your Stage I's.

This is about as far as i will go on this matter on here as much as i wanna say more,but i will get the boot.

After you add the fuel you will be told to do a ???????? i know what it is. Can anyone else guess.
I'm here for you to guess what's coming next for your Z.

Pete

PS
Tony,i don't mean to come off strong/harsh.
I know you spend some money.
Anybody that knows me knows if you ask me a question i will give you a straight answer,as a good friend of mine (wazoo guy) told me once i'm no salesman,i love him for being straight with me and i can not argue with the truth,he's right i'm no saleman.

I don't mean to come off harsh/strong if you say the word i will delete my post just say the word.

Pete I like your honesty. If there is something to be learned I am all ears.
I have Stage 1 cams installed that are my reground stock ones. Aaron Scott did mine for me back last April. I ported my own heads (saved in cost but almost had a heart attack), Aaron's machine shop put my tapperd valve guides in and did the standard 3 angle valve job. Aaron also timed my cams for me and I did the rest of the reassembly to get it running.

I am running 1 .75 Watson headers not the 2" from SW. I didn't think my 350 needed 2" headers and I was trying to keep my bottom end torque; I think it worked, I noticed no loss in bottom end but a re-dyno run will confirm. I am not smart enough to know if my exhaust cams are too big but I believe you, I just can't do anything about it now or would know the difference. Now you just made me feel better about having smaller headers then the norm.

My tune is from Aaron with secondaries removed....just to get it running until I can re-dyno it for proper tune. It is very close (A/F) though and it runs awesome.

Back to my original post about the Walbro FP, it was just a question to see if somebody has done it already. I based my FP issues off of my assessment and diagnosis of my FP pressure being 48psi on my secondary fuel pump and that it is over 20yrs........ I haven't had any issues with it until just recently. Thanks

The finished product......
Tony D.