Flex Fuel Injectors PN 25326903 flow rate?

[S.Strehler]

Anybody know what lb/hr these are and at what PSI? Trying to put together a tune and can't find solid info.

From LT1swap:

25326903 - 5.3L L59 Vin Z, flex fuel 5.3L - flows 4.164 gm/sec or 33lb/hr @ 50 psi

Random company that showed up on a google search:

Flow rate: 380cc/min at 3 BAR/36lbs/hr at 43.5 PSI <----thinking this is garbage talk

LS1tech/Performance trucks:

33@50lbs. 38@who knows



I've always heard that they are 36lb/hr. They come out to 35.54lb/hr if you run them through HPT's converter 33lb/hr @ 50psi to 58psi.

[5FDP]

Other option is just find a tune file from like 03-06 with flex fuel if you want the data for them.

I think they are like 33lb at stock 58psi fuel pressure.

[S.Strehler]

I've scoured through them. Most are adapted for a returnless systems. I found a 02 return system truck that said 33 lb/hr. What throws me is lt1swap says 33, but at 50. I would think the return system truck is rated at 58psi fuel pressure in it's tune.

[APS]

Search suburbans.

[APS]

Replacement PCM flashed with TC.hpt

[S.Strehler]

As simple as that sounds, never crossed my mind. Thank you Bo.

[S.Strehler]

33 across the board. I'm assuming that's at 58psi?

[APS]

Correct 4bar

[4.8t]

Flex fuel truck fuel pressure is 50 not 58. It?s actually ?48-52? with vacuum off. There is a different regulator on the return style flex fuel trucks.

I know this is an old thread, but I was searching a part number in some injectors I found and came across this. I?m replying so if somebody else is doing the same they have the proper information. 33lbhr at 50 in an actual flex fuel truck. If swapping to a non flex fuel truck at 58psi use the hpt calculator.