My 388 seems to die out when the gas is all the way down. I have the AFPR from Holley at around 7psi. Should I get another fuel pump that supports up to 700hp, or is my stock TBI pump enough? If it is enough, then why is it dying out?

Thanks

 

You're kidding right? I mean....why would you ever think that a pump designed to support a whopping 170hp would feed anywhere near 700?

 

It's all about the volume, not the psi. No way a stock TBI pump can support enough...

 

LOL. Seriously, it seems that a lot of people get volume and psi confused. People tend to think that as long as you have enough psi of fuel that it will support the motor when it wont support that much pressure at larger volumes.

 

He didn't say he had 700HP, he was asking if he should buy an aftermarket pump that would support 700HP.

The only way to know if your pump isn't keeping up is to monitor supply pressure under the conditions that are giving you problems. You also need to consider where your filter is in relation to the filter - if upstream of the filter, you could have good pressure and not enough flow through the filter. If downstream of the filter, low pressure may not be the pump but a clogged fuel filter.

Setting the fuel pressure at idle is at best a setting for the max fuel pressure. The regulator won't keep the pressure up there if the fuel pump can't meet the demand.

I assume you're not over in Kuwait right now...

 

He may not be making 700 hp, I dont know, but I wouldnt be suprised if he was making 3 times what the tbi motor origionally was with that setup.

 

just spend the money on a new pump... ur not getting enough fuel!

 

Aluminum has a funny way of melting around 1250-1300°...If you run it seriously lean at high rpm ----- well do you like your cylinder head? How about your pistons? Ever heard the phrase "Ohhh he burnt a piston"?

http://www.holley.com/HiOctn/ProdLin...SFP/FMSFP.html

I personally have the Holley Mechanical 170GPH...

Ron

 

How about this, I just had my high volume pump die out on me, and my father put on a stock replacement one, and now the car feels like its starving for fuel at high rpms or if I stay at WOT for an extended length of time. Won't get real high into the revs in 2nd like it would with the other pump. Of course my father accuses the floats in the carb. Could it be the pump. Im only pushing like 280 hp in the t/a, think Ive got enough fuel flow with a stock replacement pump?

 

An ounce of data is worth a pound of speculation.

Get a fuel pressure gage and find out what's going on. Fuel pressure at idle is insufficient data.

 

No I am not in Iraq yet. As I type I am in my desert uniform waiting on the next plane out of the states. My unit has had some trouble getting another flight for me and about 300 other troops. I am on my way, but all this time has got me thinking about my car back home. I will be gone for about 7 months. I should leave in about 1-2 weeks if all goes well, you have to understand the military, they have been telling me 5 stories about flights and when, my family is getting tired of it and so am I. Very soon now though.

Your right, my pump is not going to hold it up. I get great PSI at idle but at WOT it dies a lot. I am going with a 700hp pump when I get home, that should work.

Thanks for the help


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