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Old 08-26-2003, 11:05 PM
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questions about fuel system for a 434 small block chevy

hey whats happenin.

im doing a small block 434 in an s10 blazer, and had some questions about the fuel system. i got a rear sump fuel cell, and plan to run all braided fuel line.

-do you think -6 AN line will be adequate or should i go to -8 AN? all the pipe fittings in the regulator and pump i plan to use are 3/8 so do i want these nesassary restrictions on a 1/2 in(8 -an) line?

-is a holley blue pump (110 gph)a good choice? i know they are kinda loud, but is a gerotor pump worth the extra money from a performance stand point? also is 110 enough fuel?

-all the budget filters i find in summit and jegs say they flow like max 90 gph, where can i find a cheap filter that will flow more, or is 90 plenty and should i just not even worry about it?

-is a fuel log a good idea, i mean i like it mainly because it has a bypass, but it also has a gauge port, and would make installation simple; but is this nessicary? it is kinda expensive(almost 200 bucks). what are the other advantages to a fuel log? would i be better off just going with a braided dual inlet setup(which are about 100 bucks), or make one myself (fittings are still expensive).

-if i dont go with a fuel log, how else can i incorpoprate a fuel bypass into my system besides a bypass regulator? the blue pump already comes with a regulator and bypass ones start at about 75 bucks.

here is a pic of my fuel system layout, what do you think?
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Last edited by tony350ss; 08-27-2003 at 12:09 AM.
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Old 08-27-2003, 02:00 AM
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your layout looks fine, however, you should have 2 filters, one before, and one after. I`d go with the bigger line, being the 434 is a lot of cubes and when kicked to the floor it`s gonna get hungry, not to say the smaller line wouldn`t work, but to have the extra size is beneficial, and no, in your case I don`t think a fuel log will be needed. we ran a holley blue pump on a 400 small block in our mud racing days and it always served us well. get your fuel system in, get the air bled out of it, and get the pressure in order and you`ll be fine.
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Old 08-27-2003, 05:42 AM
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Ditto with DV. I have 1/2" main line feed, and 3/8" to the carb's. My 427 small block has two 650 DP Hollys and it feeds the mighty mouse fine.
I use the good Russel fuel filter.
I use a Holly mechanical high flow/pressure pump, with 3/4" line from the pump to carb then to a 3/8" feed. The larger 3/4" helps like a fuel reserve being larger, NASCAR guys use this setup,
you add it after the filter to the fuel log but you can make it from the braided fittings instead, Pic's in photo album.
Make sure you blow out the lines before install.
The new album shows the 650's with annular boosters I put in for better response.
Have fun with your MM motor.
What type of heads and intake are you using?
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Old 08-27-2003, 10:12 AM
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I used to run a 434 a few years ago in modified racing. We found that the fuel log kept the fuel from airating as well as slightly cooler at speeds and temps. I would use the 3/8 line up to 6000 RPM and 1/2 inch line for up to 9000. We never ran into fuel starvation using the 110 pump but it was a short track and throttle modulation was rampate. Slowing the RPM,s down gave more time to refill the fuel bowls. You can get a filter from System 1 that will support enough gallons per minute. This talkes about oil filters but the contact info is at the bottom.


http://www.gopurepower.com/products/...fe_filters.htm
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Old 08-27-2003, 11:02 AM
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Quote:
Originally posted by 1BAD80
Ditto with DV. I have 1/2" main line feed, and 3/8" to the carb's. My 427 small block has two 650 DP Hollys and it feeds the mighty mouse fine.
I use the good Russel fuel filter.
I use a Holly mechanical high flow/pressure pump, with 3/4" line from the pump to carb then to a 3/8" feed. The larger 3/4" helps like a fuel reserve being larger, NASCAR guys use this setup,
you add it after the filter to the fuel log but you can make it from the braided fittings instead, Pic's in photo album.
Make sure you blow out the lines before install.
The new album shows the 650's with annular boosters I put in for better response.
Have fun with your MM motor.
What type of heads and intake are you using?
you shave a 427, what kinda block are you using? is it a standard bore 400, with the 4.00 inch stroke? if so, did you have to use a small base circle cam? back to the fuel thing:

ok, so you are saying i should use like an 8 AN(1/2 in) up to the bypass, and then a 6 AN(3/8 in) to the fuel log? this would give me that "reserve" you speak of right? but the fuel log already provides a reserve doesnt it? should i still use this method? i still plan to use the fuel log, johnsongrass sold me on that one. the general consensus is that the blue pump will do fine, so i guess that is the one i will go with. i will put an extra filter after the pump like DV said, i just need to find some high flow ones now. i will try that site you posted johnsongrass.

does anyone else have any input?
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