190/75's Stock fuel pump?

weekendwarriorfsw32 · Jul 2, 2013

So I am dropping pressure with stock injectors and stock pump to 35 psi at WOT. I now have 190/75's, with a brand new OEM fuel pump and a Regulated Return hold 65psi at WOT? Trying to figure this out while I have the motor out.

windrunner408 · Jul 2, 2013

No it won't hold 65 psi at WOT. I have 190/100s and with the OEM fuel pump, RR kit, and AD150 my fuel pressure would drop to 50-52 psi. I can only imagine what it would be without the AD150.

Pizza pig · Jul 2, 2013

de-tuned it will hold pressure, I ran 190/75's with a stock fuel system and shimmed regulator for a while.

strokin6L · Jul 2, 2013

It will drop some but not too bad. I ran my 190's with stock pump and it was fine the majority of the time except for when you mash the throttle. I had fuel pressure set at 60psi and it would drop to around 50. I then got a low pressure FASS feeding the stock pump...fuel pressure never dropped at all after that.

speedracer1000 · Jul 2, 2013

im running warren 190/75s with a billet wheeled pmax and a reg return with a stock pump. last year it was fine it held 60 psi wot on erics extreme street, tried it the other day its down to 28 wot... looks like i need a fuel pump...

weekendwarriorfsw32 · Jul 3, 2013

What FASS lift pump are you using, I did a quick look and didn't see it.

strokin6L said:
It will drop some but not too bad. I ran my 190's with stock pump and it was fine the majority of the time except for when you mash the throttle. I had fuel pressure set at 60psi and it would drop to around 50. I then got a low pressure FASS feeding the stock pump...fuel pressure never dropped at all after that.

Mdub707 · Jul 3, 2013

... I know I'm beating a dead horse again...

but I bet most of you saying it held pressure ok, were reading at the fuel bowl weren't you?

ncdzl · Jul 3, 2013

Mdub707 said:
... I know I'm beating a dead horse again...

but I bet most of you saying it held pressure ok, were reading at the fuel bowl weren't you?

Where is a desired reading taken from?

fordfreak4life · Jul 3, 2013

ncdzl said:
Where is a desired reading taken from?

back of the heads

Sent while spinning 18 wheels

Mdub707 · Jul 3, 2013

With stock injectors and a race tune, reading fuel pressure at the fuel bowl it shows the same readings you guys are seeing... reading behind the heads it shows dropping to 25psi or less... on an even milder tune.

fordfreak4life · Jul 3, 2013

Mdub707 said:
With stock injectors and a race tune, reading fuel pressure at the fuel bowl it shows the same readings you guys are seeing... reading behind the heads it shows dropping to 25psi or less... on an even milder tune.

a1000, modified rr ftw

Sent while spinning 18 wheels

Spindrift · Jul 3, 2013

I had this exact setup on the Ex. When I put the truck on the dyno, fuel pressure dropped to zero. That was the last dyno run for that truck...and not too long afterwards, she popped her gaskets.

Mdub707 · Jul 3, 2013

fordfreak4life said:
a1000, modified rr ftw

Sent while spinning 18 wheels

I will do a sump to a fuelab with custom filter setup feeding into the heads. RR is out of the question for me... I think. Though I might copy what PGreenSVT did on the ORG with his regulator in front of the heads.

Realistically... I'm a cheap ***ker, so I'll probably try out the stock 6.4 pump feeding my stock 6.0 pump.

Spindrift said:
I had this exact setup on the Ex. When I put the truck on the dyno, fuel pressure dropped to zero. That was the last dyno run for that truck...and not too long afterwards, she popped her gaskets.

This was with 190's and a stock fuel system?

fordfreak4life · Jul 3, 2013

Mdub707 said:
I will do a sump to a fuelab with custom filter setup feeding into the heads. RR is out of the question for me... I think. Though I might copy what PGreenSVT did on the ORG with his regulator in front of the heads.

Realistically... I'm a cheap ***ker, so I'll probably try out the stock 6.4 pump feeding my stock 6.0 pump.

This was with 190's and a stock fuel system?

I'm running a fuel system I built with a dozers return I bought and modified, mine regulates the fuel after the heads and returns down the factory suction line

Sent while spinning 18 wheels

OBS F350 · Jul 3, 2013

I don't even want to know what my fuel pressure drops to LOL I'm only seeing like 3.6 ICP voltage at WOT also :doh:.

Spindrift · Jul 3, 2013

Mdub707 said:
I will do a sump to a fuelab with custom filter setup feeding into the heads. RR is out of the question for me... I think. Though I might copy what PGreenSVT did on the ORG with his regulator in front of the heads.

Realistically... I'm a cheap ***ker, so I'll probably try out the stock 6.4 pump feeding my stock 6.0 pump.

This was with 190's and a stock fuel system?

Yes.

TooMuch03 · Jul 3, 2013

I had a stock 6.0 pump feeding 185/70s with a regulated return. held 62psi everywhere. pressure measured at the regulator.

strokin6L · Jul 3, 2013

weekendwarriorfsw32 said:
What FASS lift pump are you using, I did a quick look and didn't see it.

Depends on what year truck yours is. If its an early build this is the one TF12095G...if its a later build you want this one TF11095G. These are the titanium series low pressure pumps @ 15psi.