Fuel pump upgrade Questions

ga94gt · Oct 16, 2007

I will soon be changing my fuel tank because of a leak, and so i thought that I should go ahead and change my fuel pump while the tank is out.

So the question I have is can I put a 190 lph fuel pump in with the mods in my sig untill I get the new motor in? I was wondering if it would be putting to much fuel to the car. I don't have a fuel pressure regulator but there is one in the very near future.

The reason I want to up grade is because I am in the process of building a 306.

Garrett

HISSIN50 · Oct 17, 2007

I think you mean you don't have an adjustable FPR (you have a stock FPR we hope). Since we use a return-style fuel system, you really cannot go too big with your pump. A 190 or 255 should be fine.

Don't forget a new tank grommet (20 bucks at the dealership).

BTW, what's a Loidio LMAF (or is it LoadIO LMAF)?

Good luck.

go-stang5.0 · Oct 17, 2007

I would just go with the 255lph pump the price differerence between that and a 190 is minimal. 190 is prolly good for close to 500 N/A hp...but if you ever get any kind of power adder you'll be happy you got the 255. Spend the extra 10-20 bux now and it may keep you from getting a $250 in-line fuel pump later, if you go for major power.

vladasap · Oct 17, 2007

with the 24lbs and the 90mm mass air i'd deff go bigger with the pump. You got nothin' to lose since we have a return system, and any gas that is not used goes back to the tank, so i dont see why not. I just upgraded to a 255 wabro- cant say anything negative - so far...

*when it breaks its time to upgrade it !!!

ga94gt · Oct 17, 2007

HISSIN50 said:
I think you mean you don't have an adjustable FPR (you have a stock FPR we hope). Since we use a return-style fuel system, you really cannot go too big with your pump. A 190 or 255 should be fine.

Don't forget a new tank grommet (20 bucks at the dealership).

BTW, what's a Loidio LMAF (or is it LoadIO LMAF)?

Good luck.

The Load IO stuff is made by Anderson fod and it allows you to change the size of your injector and all you have to do is program a little box that changes the programing of the MAF for the injectors.

Scroll down to What is New Aug 3
http://www.andersonfordmotorsport.com/

Stanger007 · Oct 17, 2007

HISSIN50 said:
I think you mean you don't have an adjustable FPR (you have a stock FPR we hope). Since we use a return-style fuel system, you really cannot go too big with your pump. A 190 or 255 should be fine.

Don't forget a new tank grommet (20 bucks at the dealership).

Good advice as always from JT. I ran a 255 when my car was pretty much stock (the 88lph pump was making noise so I swapped it). Ran fine for a year or two just like that before the mods really started.

HISSIN50 said:
BTW, what's a Loidio LMAF (or is it LoadIO LMAF)?

Never seen this one before!

http://www.andersonfordmotorsport.com/new_products/loadtuner.html

LOL... "Download Symplified Instructions"

I downloaded the software - their box is remapping output voltages the LMAF is putting out... interesting product. HISSIN, isn't your MAFTuner similar?

Wes

ga94gt · Oct 17, 2007

Any brand recomendations?

Stanger007 · Oct 17, 2007

Most pumps are made by Walbro.

I know the BBK and Summit are for sure.

gcomfx.com · Oct 17, 2007

Yup, go to the 255.... I wasted some time and money going the two step route with a 190 then 255.

HISSIN50 · Oct 17, 2007

Stanger007 said:
........ their box is remapping output voltages the LMAF is putting out... interesting product. HISSIN, isn't your MAFTuner similar?

Wes

Wes, Good memory! AFAIK, it's the same exact thing. It seems to get different names for different Makes. I.e., German cars use the same device and call it something else (it's popular with 944 Turbos). Ditto for DSM's. I have a file somewhere showing who made the original unit.

Ga, I knew what Load IO was - I didnt know what Loidio was (there are a few custom tuners/pros with names similar to that - I thought it might have been a custom one-off tune).

Car Nut · Oct 17, 2007

Brand........

I went with the FRPP 190 pump assembly, because it literally replaces everything inside the tank with brand new parts and larger lines.

I'm basically stock, and with the new 190 pump, I've seen nothing negative. On the positives, my gas mileage didn't get worse and the pump itself is 100x quieter. Also I truly believe that I have a little more power in the higher rpm range (4K-5.5K), now that plenty of fuel can be delivered as needed.

toyman · Oct 17, 2007

HISSIN50 said:
I think you mean you don't have an adjustable FPR (you have a stock FPR we hope). Since we use a return-style fuel system, you really cannot go too big with your pump. A 190 or 255 should be fine.

I was reading somewhere recently that using a much larger than necessary fuel pump starts to add heat as more fuel is recirculated. The inference was that if we go to great lenghts to ensure that the intake air is as cold as possible it makes no sense to be adding heat via the fuel. I don't recall any reference to specific dyno runs showing the effects of heated fuel but intuitively it does seem to make sense.

HISSIN50 · Oct 17, 2007

toyman said:
I was reading somewhere recently that using a much larger than necessary fuel pump starts to add heat as more fuel is recirculated. The inference was that if we go to great lenghts to ensure that the intake air is as cold as possible it makes no sense to be adding heat via the fuel. I don't recall any reference to specific dyno runs showing the effects of heated fuel but intuitively it does seem to make sense.

You are correct (I used to post this same argument years ago before I gave up - everyone bought pumps that were overkill anyhow). There's also additional amperage draw from the larger pumps. I don't mind - it means it's easier for me to buy 155's.

On some cars (i.e. 944 Turbos - I used to be a Porsche guy), heating the fuel is a huge deal. I also haven't seen Mustang dyno numbers but I cant imagine that in the real world (I totally see your theoretical point) it makes a meaningful amount of difference. For instance, I wonder if simply keeping the tank over 1/2 full with a large pump accomodates cooler fuel than running a 95 LPH pump near empty.

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