Will not having a bigger fuel pump have negative effects on my stang?

[CManT1914]

TFS h/c/i combo + stock fuel pump = bad idea?

I never did get around to putting in a bigger fuel pump yet. I was about to order one when I wondered if having the stock fuel pump on would cause any problems. I'll probably order one tomorrow anyway, I was just wondering.

 

[tomustang]

if your running too much hp for the stock pump you won't have enough fuel to power the engine.

 

[Pokageek]

I am going to guess "pinging" that you CAN'T hear could be the dangerous aspect of that. How dangerous..don't know.

 

[Labora]

Just depends. If you are running lean could be very bad. I would hope after you did your HCI you have been checking the plugs to make sure they are colored right and you aren't running too rich/lean?

 

[final5-0]

Don't strain the brain!

Just put the 255lph pump in the tank and be done with it.

Later
Grady

 

[BlackVert]

your combo could use a 255 lph pump and 24# or 30# injectors. why take a chance on not being able to get enough fuel to the engine when you step on it? i'm sure you already know how bad running lean can be for it ...

just my $.02

 

[CManT1914]

Well actually I'm having the opposite problem, I'm running to rich. I already have 30lb injectors in there, and my plugs are definitely fouled out from gasoline, so I'm not running lean. Just wondering if there were any other side effects. But I'll order a fuel pump tomorrow anyway.

 

[HISSIN50]

Good call Chris. The richness you see now is from a lack of tune (my guess). But at WOT, you might end up being lean.

I find that it is very hard to read EFI plugs - even when done correctly after a blast. The EFI just trims fuel too well and runs too lean in general (not like reading carbed plugs).

Good luck Chris.

 

[Venom351R]

Grady speaks the truth.

 

[final5-0]

Good call Chris. The richness you see now is from a lack of tune (my guess). But at WOT, you might end up being lean.

I find that it is very hard to read EFI plugs - even when done correctly after a blast. The EFI just trims fuel too well and runs too lean in general (not like reading carbed plugs).

Good luck Chris.

JT

Been watchin some of your replies and from the looks of em......................

Me thinks your frustration is gonna cause you to come over to the self tuning camp in the near future

Later
Grady

 

[CManT1914]

JT

Been watchin some of your replies and from the looks of em......................

Me thinks your frustration is gonna cause you to come over to the self tuning camp in the near future

Later
Grady

Yea if he finds a twEECer for the right price, I think he might succumb to the bug.

 

[94MustangGT5.0]

I may be wrong, but just because you are running rich does not mean you have adequate fuel pressure. The bigger injectors can be fed fuel through the stock pump, but they won't have enough pressure to do the job that a bigger pump would.

 

[CManT1914]

Well I'm looking at fuel pumps right now. I can get a Holley 255lph for $125, a Holley 190lph for $118, a BBK 255lph $122, or a BBK 190lph for $112. Any thoughts on what's better?

 

[Grn92LX]

I paid $107 shipped for my 255 high pressure pump. Its a walbro, just like all the other ones you mentioned except the manufacturers put their name on the box.

 

[HISSIN50]

Mike is right on - the BBK will probably have Walbro stamped on the side of it.

That is what I meant before - the 255 is a couple bucks more - might as well go bigger since there is no real downfall from doing so (that I know of).

Grady and Chris, you are both right on. I have been pestering Chris for info on simple things about the TwEECers so I have a little better idea of how all this stuff works. With my luck I would get one and it would do a wicked-witch on me and melt (I hope those things can take interior temps of 180*F+). But yeah, I think one would be cool. Chris is spot on - I would need donations for that one. Perhaps they could just be made to the 'new wheels fund' that I think Greg started on my POS wheel spacer thread.

 

[CManT1914]

Hey all right, I found walbro's on eBay. I'm looking at the 255, I can get it for $103 shipped, and it's close too.

JT, somebody started a donation fund for new wheels?

 

[HISSIN50]

JT, somebody started a donation fund for new wheels?

I wish!

On my wheel-spacer thread, one suggested-way to deal with the issues I have was to get new wheels. I wish! As I said on there, if I did that, I would be running around with nice wheels and 315's out back, like my buddy Chris.

 

[final5-0]

I may be wrong,

No your not

but just because you are running rich does not mean you have adequate fuel pressure. The bigger injectors can be fed fuel through the stock pump, but they won't have enough pressure to do the job that a bigger pump would.

Looks good to me

Later
Grady

 

[94TURBO5 O]

Don't strain the brain!

Just put the 255lph pump in the tank and be done with it.

Later
Grady

Yup I ran just fine with a 255 intank only with all my past combos.
I just recently added an inline for the turbo set-up.