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ANOTHER FUEL PRESURE QUESTION

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ANOTHER FUEL PRESURE QUESTION

Postby 1STGENFARMBOY » Fri Oct 09, 2009 9:56 pm

I just put a mechanical fuel presure gauge on tonight, fired up the old truck and 3psi at idle :shock: :shock: :shock: got the threded banjo bolt from genos and put it post filter, Im going to put it pre filter in the morning and see what i have, Hopefully its a clogged filter.. OH BUY THE WAY IT DROPS TO (O) VERY FAST UNDER POWER. :pale:
93 W250 STD CAB, AUTO 3.55, GAUGES, 80HP DDP STICKS, DENNY T ,16CM HOUSING, 60MM GILLETT, VE MAXED,BHAF, BHFF, 366 SPRING,P/S INTERCOOLER, TIMS COOLER TUBS, TIMMING 1/8 BUMP,4in TURBO BACK TO DUEL 5IN STACKS,33 12.50 BFG, HOLLEY BLACK, CONVERTER COOMING.
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Postby peobryant » Fri Oct 09, 2009 10:20 pm

Sounds about right for the stock lift pump. Stock should be about 3-5psi at idle, and with your mods, I'm sure you can easily pull it down to 0psi. Time for a piston lift pump. :D
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1991 Dodge Ram D350, Cummins Turbo Diesel, A518
1972 Mercedes-Benz 220D, OM615 Diesel, 4 Speed Manual
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Postby Richie O » Sat Oct 10, 2009 1:12 pm

I can pull the piston pump down to 3 psi. :D
1989 W250 727, 3.07 L/S, S300, P/S Intercooler, Stans exaust, Pump adjustments, 127k miles,297 hp
1993 W250 extended cab, rag, 4.10 l/s, 6x16's, HTT 62/71/14 piston l/p, Isspro EV series tach, fuel pressure, boost, oil pres, water temp, volt, pryo, 132k/ 301 hp
1992 W250 with NV4500, 3.54's, 16cm 60mm GDS H1C, ground stock cone, Isspro tach, pryo, boost, fuel pressure, slow, rusty, dented,180k
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Postby Ace » Sat Oct 10, 2009 2:05 pm

My FP runs around 16-17 and I can't get it below 15. :)
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Postby PToombs » Sat Oct 10, 2009 5:52 pm

A stock LP should be 5-7 at idle, not less than 3psi at WOT. That's stock, of course. With your mods what you have is probably darn good! :lol:

Rich, time for a draw straw and bigger lines! ;)
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Postby Richie O » Sat Oct 10, 2009 6:00 pm

PToombs wrote:A stock LP should be 5-7 at idle, not less than 3psi at WOT. That's stock, of course. With your mods what you have is probably darn good! :lol:

Rich, time for a draw straw and bigger lines! ;)



Nah! time to get some better, cooler air in it first. I hit 1500 easy today.
1989 W250 727, 3.07 L/S, S300, P/S Intercooler, Stans exaust, Pump adjustments, 127k miles,297 hp
1993 W250 extended cab, rag, 4.10 l/s, 6x16's, HTT 62/71/14 piston l/p, Isspro EV series tach, fuel pressure, boost, oil pres, water temp, volt, pryo, 132k/ 301 hp
1992 W250 with NV4500, 3.54's, 16cm 60mm GDS H1C, ground stock cone, Isspro tach, pryo, boost, fuel pressure, slow, rusty, dented,180k
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Postby 1STGENFARMBOY » Sat Oct 10, 2009 6:12 pm

Ok Richie How can my truck pull hard all the way to 85mph and show 0 psi from 20 mph on up im very scared of that,,, will it trash my pump or just start running crapy whin it starves for fuel :shock: :(
93 W250 STD CAB, AUTO 3.55, GAUGES, 80HP DDP STICKS, DENNY T ,16CM HOUSING, 60MM GILLETT, VE MAXED,BHAF, BHFF, 366 SPRING,P/S INTERCOOLER, TIMS COOLER TUBS, TIMMING 1/8 BUMP,4in TURBO BACK TO DUEL 5IN STACKS,33 12.50 BFG, HOLLEY BLACK, CONVERTER COOMING.
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Postby PToombs » Sat Oct 10, 2009 6:12 pm

Shoot, I hit 1500 easy all the time! ;)
:finger:
pete

Just enough power to break everything behind the crankshaft.
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Postby Richie O » Sat Oct 10, 2009 6:30 pm

1STGENFARMBOY wrote:Ok Richie How can my truck pull hard all the way to 85mph and show 0 psi from 20 mph on up im very scared of that,,, will it trash my pump or just start running crapy whin it starves for fuel :shock: :(


I drew my 93 down to 0 with the stock diaphram pump and the truck ran great. It is not good for the injection pump. That is why I upgraded. Some will run crappy when down to 0 psi. It retards the timing also when the case pressure gets low in the injection pump. So don't do it. :D
1989 W250 727, 3.07 L/S, S300, P/S Intercooler, Stans exaust, Pump adjustments, 127k miles,297 hp
1993 W250 extended cab, rag, 4.10 l/s, 6x16's, HTT 62/71/14 piston l/p, Isspro EV series tach, fuel pressure, boost, oil pres, water temp, volt, pryo, 132k/ 301 hp
1992 W250 with NV4500, 3.54's, 16cm 60mm GDS H1C, ground stock cone, Isspro tach, pryo, boost, fuel pressure, slow, rusty, dented,180k
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Postby 1STGENFARMBOY » Sat Oct 10, 2009 6:54 pm

So i read the post on piston lift pump upgrade using a 2nd gen and it shows a spacer and a new line going from the lift pump to the filter head is all that for a 2nd gen also, my 5 parts stores around here cant do nothin with cummins part numbers there pretty lame.. :x :x
93 W250 STD CAB, AUTO 3.55, GAUGES, 80HP DDP STICKS, DENNY T ,16CM HOUSING, 60MM GILLETT, VE MAXED,BHAF, BHFF, 366 SPRING,P/S INTERCOOLER, TIMS COOLER TUBS, TIMMING 1/8 BUMP,4in TURBO BACK TO DUEL 5IN STACKS,33 12.50 BFG, HOLLEY BLACK, CONVERTER COOMING.
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Postby 1STGENFARMBOY » Sat Oct 10, 2009 6:57 pm

Also will my factory lines and tank pickup lines allow the fuel to flow or do i have to do the draw straw. :?
93 W250 STD CAB, AUTO 3.55, GAUGES, 80HP DDP STICKS, DENNY T ,16CM HOUSING, 60MM GILLETT, VE MAXED,BHAF, BHFF, 366 SPRING,P/S INTERCOOLER, TIMS COOLER TUBS, TIMMING 1/8 BUMP,4in TURBO BACK TO DUEL 5IN STACKS,33 12.50 BFG, HOLLEY BLACK, CONVERTER COOMING.
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Postby PToombs » Sat Oct 10, 2009 7:09 pm

That's not a 2nd gen pump. It's an Ag application pump, low pressure. A 2nd gen pump puts out 25 -30 psi, which our IP's won't take.
You need the pump, spacer, line and 2 gaskets. You may also need to trim the insulation on the tappet cover with a utility knife for the line to clear. Upgrading to a draw straw is a good idea, but may not be necessary. Just change the pump and watch the pressure. Richie has stock lines and does ok with them.
pete

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Postby 1STGENFARMBOY » Sat Oct 10, 2009 7:16 pm

If i get the ag pump will i have to put a regulator on it ?? Because i was planning to put one on it to get it down to 15psi, that would great if i didnt need it. :?
93 W250 STD CAB, AUTO 3.55, GAUGES, 80HP DDP STICKS, DENNY T ,16CM HOUSING, 60MM GILLETT, VE MAXED,BHAF, BHFF, 366 SPRING,P/S INTERCOOLER, TIMS COOLER TUBS, TIMMING 1/8 BUMP,4in TURBO BACK TO DUEL 5IN STACKS,33 12.50 BFG, HOLLEY BLACK, CONVERTER COOMING.
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Dumb question...

Postby MMeier » Sat Oct 10, 2009 7:45 pm

... where are you guys plumbing in a fuel pressure gauge ? I see this small plug on a banjo above the filter head, is that where you put it... alot smaller then 1/8 NPT, what size is that ?
'93 W250CC, 5 speed, 3.54's, pump tweaks, NV4500 conversion, straight piped, 33's. Also, have '03 3500 QC 4WD dually, 551HP/ 1008 TQ @ MATS '07
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Postby 1STGENFARMBOY » Sat Oct 10, 2009 8:00 pm

Mat that small plug is the air bleeder, what you want is an aftermarket banjo from genos garage thats taped for 1/8th in pipe, and allso has 180th holes, stock one has 150th, :) Dar
93 W250 STD CAB, AUTO 3.55, GAUGES, 80HP DDP STICKS, DENNY T ,16CM HOUSING, 60MM GILLETT, VE MAXED,BHAF, BHFF, 366 SPRING,P/S INTERCOOLER, TIMS COOLER TUBS, TIMMING 1/8 BUMP,4in TURBO BACK TO DUEL 5IN STACKS,33 12.50 BFG, HOLLEY BLACK, CONVERTER COOMING.
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