Fuel Pressure - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 6 (permalink) Old 06-15-2007, 03:37 PM Thread Starter
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Cool Fuel Pressure

Heres my question, hope somebody can help. Right now I have a carter 100 gph lift pump and I am only getting 10 pounds of fuel pressure at idle and 6 at full throttle. My idea was to buy another one of the same pump and mount it farther up the frame and put it on an auxilary switch and just kick it on once I got the truck started. Has anybody else done this and did it work or if not do you think it would work good enough and give me better pressure. I would like to get around 16- 18 pounds at idle.:smoke
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post #2 of 6 (permalink) Old 06-15-2007, 03:55 PM
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Its hard to say if it would give you enough pressure, I would imagine so, but can't say for certain.

As far as the auxilary switch. I don't like doing a switch because in the case of an accident you could be knocked unconcious and your fuel pump may still be running pumping diesel. I have the same issue with my FASS though, the pressure is too high and makes hot starting difficult. I hooked mine up to an oil pressure switch. That way as soon as the engine comes on and hit 4psi oil pressure, the FASS turns on. I also like this set up because I don't have to explain anything about turning a switch on and off, if someone else is driving my truck. If you want to go the oil pressure switch route. shoot me a PM and I'll get you the part number and some pics and instructions on how to run it.
Sean

2000 2500 reg. cab 4x4 auto 577hp
09 6.7L QC LB stick, 4x4.

TOTAL PERFORMANCE DIESEL 707-545-FUEL (3835)
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post #3 of 6 (permalink) Old 06-15-2007, 03:58 PM
 
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I run a $120 holley blue w/o regulator through the sad stock lift pump and still get 26-30 at idle and it won't drop below 19-20 at wot with the edge on 5, no injectors though
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post #4 of 6 (permalink) Old 06-15-2007, 08:18 PM
 
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Originally Posted by sstockton
I have the same issue with my FASS though, the pressure is too high and makes hot starting difficult.

i have a fass system and once it got into the 80's/90's here in oklahoma sometimes my truck cranks for a couple seconds before it turns over. is this b/c of the fuel temp/air temp/ having a high pressure fass?
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post #5 of 6 (permalink) Old 06-15-2007, 11:18 PM
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Is that with a motor that has been running or sitting long enough to cool off. Mine would still start fine on a cold motor, but once the engine was warm, if I had to restart the truck, it would crank for several seconds before firing.

If you ran your truck below 5psi ever, the fuel metering diaphram in the VP will move up to 2.0mm it is only designed to move 0.5mm. Moving 4x its intended amount will cause cracks in the diaphram that weaken it. The higher pressure put out by the FASS or sometimes even a new stock lift pump will force the "Cracked" metering diaphram shut, making starting difficult. The metering diaphram is needed pretty much only for hot starts and that is why the truck is effected only on hot starts.

A good test to see if this is your problem, is to disconnect the FASS from the wiring harness and see if your truck still requires a bit of cranking to start. If the metering diaphram is the problem, no hard start should be experienced. If the trucks starts easily, shut it off, because you're now running without a lift pump and thats no good. Reconnect the lift pump and then hook up an oil pressure switch, that way the FASS starts once the truck has started. It works like a charm, I have been running like that for a while now and no problems.

I installed my fass in winter, and didn't have a problem with hot starts until the temps came up a little higher in late spring early summer. So that could be what you're facing here.
Sean

2000 2500 reg. cab 4x4 auto 577hp
09 6.7L QC LB stick, 4x4.

TOTAL PERFORMANCE DIESEL 707-545-FUEL (3835)
www.totalperformancediesel.com
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post #6 of 6 (permalink) Old 06-16-2007, 05:10 AM
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Huh, this is the problem that just started for me about two days ago. I don't get why it started over two years after I put it in. Atleast I know what the problem is, thanks.

'01 xcab 4x4,Suncoast by Mike L. Goerend triple, edge III, AFE stage II, HTT 62/12, FASS, and other stuff
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