Share your thoughts on my fuel question?

[EclipticalGS]

Hello all,

I have run into a bit of a hiccup, a small one.

I have had a nice build going now for a while, I am about wrapped up here and am looking for opinions on fuel set-ups.

While I'm down there I want to get everything out of the way, even for the potential future...

First, is there a difinitive tried/true In-tank fuel pump that can handle 500-600 whp? (I hear so much mixed reviews on everything its hard to take anything away from it all)

Second, I want to go with -8an Feed lines from the tank to metal filter to rail, then on to -8an into my Fuellab, then a -6an return.

Will the -6an return line suffice for an -8an feed while having a lot of flow from a larger pump, I guess that is really my main question here?? I dont want to go into boost, let off and have my FPR not be able to rid the pressure effectively, putting me rich into the next gear... You could call this being "over-ran"

Anyone run this set-up no issues? Im a few good posts away from purchase thanks.

 

[92AWDHX40]

Well there are different pumps out there, first of all have you done any research on fuel pumps,and set ups for those horsepower levels?

 

[Colt4G63 also]

I just figured out how much fuel my injectors could flow, and chose a pump that would meet my volume and pressure demands. All it takes is a little math and research.

As for the line size thing, I just ran the same size return line as I ran for the feed. Problem solved!

 

[EclipticalGS]

I just figured out how much fuel my injectors could flow, and chose a pump that would meet my volume and pressure demands. All it takes is a little math and research.

As for the line size thing, I just ran the same size return line as I ran for the feed. Problem solved!

Well that sounds great but my FPR is -6an return

 

[3kgt2nv]

i use a a1000 fuel pump with a -8 going to a -6 return. the fpr is going to allow fuel to leave fast enough that your not going to over run the fpr. if your concerned about it get the aem fpr as that has adjustable pressure relief openings for quicker pressure relief.

for intank pumps you could do twin stealth 340 or twin 400's and have plenty of fuel

 

[DSMTyson]

I dont want to go into boost, let off and have my FPR not be able to rid the pressure effectively, putting me rich into the next gear... You could call this being "over-ran"

Sounds similar to my 1G N/T FPR that I've been running on my Walbro 255hp for the last year. Little bastard is tough.

A lot of people run -8 feed and -6an return with no issues.

Dual walbro 255s, or 1 in tank Walbro 255 with an in-line pump of your choice would be plenty for 5-600 hp.

 

[EclipticalGS]

Sounds similar to my 1G N/T FPR that I've been running on my Walbro 255hp for the last year. Little bastard is tough.

A lot of people run -8 feed and -6an return with no issues.

Dual walbro 255s, or 1 in tank Walbro 255 with an in-line pump of your choice would be plenty for 5-600 hp.

That is another option but im really looking for a single.

With the in-tank to inline; I have read that the inline still relies on the in-tank to pump to the inline so your not really getting double the flow which makes no sense to me because you do have two pumps working in unison on load demands. (I read this in a thread on here)

Opposing this theory is that the inline pump adds syphon to the outlet of the in-tank pump, thus making it already move that amount up and through the in-tank pump, and the in-tank pump is also there compounding the flow by propelling its load of fuel as well. I cant see how that wouldn't be close to double the flow. (Asked a Chemical engineer at work who works with multiple pumping systems.)

I guess the best thing I can try is to also calculate at what point a -8an line reaches its max flow at ~80psi (43.5 base pressure + 35psi from holset) Im sure -8an can support 69 lb/min from the holset though..

 

[Purple_Demon]

I found this a while back and it helped me out a bit. Depending on how much air you wind up flowing, you may or may not need a extra pump.

http://www.dsmtuners.com/forums/articles-tuning-ecu/366003-injector-fuel-pump-supported-airflow.html

 

[boost97gst]

walbro 450?

 

[EclipticalGS]

I found this a while back and it helped me out a bit. Depending on how much air you wind up flowing, you may or may not need a extra pump.

http://www.dsmtuners.com/forums/articles-tuning-ecu/366003-injector-fuel-pump-supported-airflow.html

Yeah it looks as If I may have to go with an in-tank and in-line, I havent seen a single pump yet that I can trust which can flow 70 lbs/min @ 30-35psi (+base pressure). I know it is unlikely to achieve that but I want it to hold up.

With (2) fuel pumps working on load pressures together im sure they can both push into my range of pressure needed.

I was hoping so hard for the DW300 Deatchswerks but Ive already seen a review from Calan who has already had issues with the pump dropping off in pressure well before it even sees its pressure release point (100 psi).

When he added a Boost-a-pump it was keeping the pressure up consistently.

I am wondering if -8an lines (which has more volume) puts excess load on a pump, compared to a pump propelling through a -6an line. Could that be an issue??

Do you have to work harder to blow fluid through a necked down straw to see 25psi at the other end, or a necked down sewer (same size neck) pipe to see 25psi..

Common knowledge tells me sewer drain would be harder because there is more volume to move. Would it have any affect small scale?

 

[3kgt2nv]

the pressure is built by the restriction from the fpr not from the pump cramming more fuel into the line.

a hot wired 400 should be enough with a boost a pump. on 3000gt no one has had luck with the deathworks pumps. they all seem to die off and cause issues.

the a1000 flows 150gph at 13volts which is 568 lph if you need more than that wow

 

[EclipticalGS]

the pressure is built by the restriction from the fpr not from the pump cramming more fuel into the line.

a hot wired 400 should be enough with a boost a pump. on 3000gt no one has had luck with the deathworks pumps. they all seem to die off and cause issues.

the a1000 flows 150gph at 13volts which is 568 lph if you need more than that wow

when pressure is built in the line, there is more load placed on the pump. That's why every chart of a fuel pump shows flow decreasing as pressure increases.

I'll check into that a1000 seems unreal!!

Thanks 3kgt

 

[LandSpeed-DSM]

I'm using a Magnafuel 4303. Heres some conservative numbers I plugged in for it:https://docs.google.com/spreadsheet/ccc?key=0Ahi5eTgzfWg_dHh3RGpienAyYXRrNUF3c2Y0cEwyNlE

Cost me ~$485 from Summit and will more than meet your goals.

It's also the only electric pump of this capacity rated for continuous duty (read: street use) that I have been able to find, without using a stepdown box.

Its not an in-tank pump though.

 

[Purple_Demon]

I made the mistake of thinking a 255hp rewired would get me to 500whp. After seeing that link I posted I began to wonder the same thing as you. I am currently looking into an inline pump, but also the boost-a-pump.

Let me know how your choice works out or if you come across any info, Ill check back on the thread to see.


EDIT:


AS far as the inline pump, if you are worried about having to get correct fittings and AN lines, dont be. It is really easy to get the right ones and making the line itself is alot easier than what most say.

 

[EclipticalGS]

I made the mistake of thinking a 255hp rewired would get me to 500whp. After seeing that link I posted I began to wonder the same thing as you. I am currently looking into an inline pump, but also the boost-a-pump.

Let me know how your choice works out or if you come across any info, Ill check back on the thread to see.


EDIT:


AS far as the inline pump, if you are worried about having to get correct fittings and AN lines, dont be. It is really easy to get the right ones and making the line itself is alot easier than what most say.

By this weekend I will have purchased the following;

Bosch 044 Inline pulling from my already re-wired Wally 255LPH in-tank
-8an tank to inline pump to Fuelab filter to Magnus rail, -8an to Fuelab AFPR, -8an out to the fpr and -8an return line.