Turning up the pump tech help wanted.
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Fleet Mechanic
Joined: Jul 2010
Posts: 1,753
Likes: 34
From: Los Angeles, Ca.
Turning up the pump tech help wanted.
I've read all I can find, and still have questions about what changes when you crank it up. In essence, is it just allowing more accelerator throw?-Meaning will it change the fuel usage and EGT at cruise & light throttle or just allow more 'range' of fueling? Will it raise the idle speed and have to be corrected after tweeking?
Cargo Master
Joined: Feb 2008
Posts: 3,409
Likes: 1
From: back in SE Iowa
i strongly recommend not messing with the pump unless you already have a pyro installed.turning the pump up has nothing to do with the accelerator throw,you just allow more fuel to flow it wont effect the idle speed or anything.currently are you getting any smoke under throttle?
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
No it does not increase the accelerator throw.
It increases the fuel shot volume.
Yes it'll change the fuel usage.
Yes it'll change the EGT's - Don't turn the fuel up unless you have a pyrometer.
No it'll not increase the idle.
-Enjoy
fh : )_~
It increases the fuel shot volume.
Yes it'll change the fuel usage.
Yes it'll change the EGT's - Don't turn the fuel up unless you have a pyrometer.
No it'll not increase the idle.
-Enjoy
fh : )_~
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Fleet Mechanic
Joined: Jul 2010
Posts: 1,753
Likes: 34
From: Los Angeles, Ca.
I get no visible smoke at any time. I don't 'need' more power at the moment, but it'll be nice once I start towing my boat. So is there any pump mod that'll add more fuel just on demand? It seems odd that you can only bump fuel in a way that it would use more fuel all the time. More fuel=more power basically, so it seems that at cruise it would stay the same and just allow you to make more power when you step on it. I understand that at half acceleration after modding would fuel more, but turning the pump up (in my thought) would allow you to make half throttle power at less than half throttle. How can it make the same power, say cruise speed, while delivering more fuel? That would mean that turning the pump up makes the system less efficient somehow.(?) Am I totally missing something on the fuel/power relationship?
Postmaster
Joined: Jan 2010
Posts: 4,319
Likes: 4
From: Elk City, OK
no there isnt. turning the screw is what you got. you can always add a turbo, that will be power on demand since the boost really doesnt kick in until your under a load and gettin on the throttle. put get a pyro like everyone said. not worth risking killing your engine.
Postmaster
Joined: Jan 2010
Posts: 4,319
Likes: 4
From: Elk City, OK
how many miles do you have on your injectors and ip? if your nearing 100k then its time to change the injectors and getting your ip rebuilt. that will help on mileage and power big time. turning up the fuel one or two flats will help you get more power though out the power range.
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Fleet Mechanic
Joined: Jul 2010
Posts: 1,753
Likes: 34
From: Los Angeles, Ca.
The van has 160K., the pump looks to have been rebuilt-fairly clean and little paint dots on the screws. Don't know when it was done tho. Aside from an air leak affecting start up, it runs smooth and steady. Power feels alright, but it's been years since I used to drive these more regularly. I guess I'll wait 'till I have a pyro and establish my MPG then start playing with the pump to see what happens.
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Fleet Mechanic
Joined: Jul 2010
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From: Los Angeles, Ca.
Still pounding the net and my brain to no avail. So to be concise, turning up the pump will make it use more fuel at all speeds and loads?
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Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
Turning up the pump increases the max fuel delivered.
So since you are increasing the fuel able to be delivered, fuel useage will increase.
Even though that is not exactly right, deduction tells me it is exactly right.
Since you want to turn the pump up, you are looking for more power.
If you use the power increase, it takes more fuel to make more power.
So logically, if you turn the pump up, you will use more fuel.
Show me a person that has a 400 HP engine, and never uses more than 100 HP of the potential power.
That is a very rare person.
So since you are increasing the fuel able to be delivered, fuel useage will increase.
Even though that is not exactly right, deduction tells me it is exactly right.
Since you want to turn the pump up, you are looking for more power.
If you use the power increase, it takes more fuel to make more power.
So logically, if you turn the pump up, you will use more fuel.
Show me a person that has a 400 HP engine, and never uses more than 100 HP of the potential power.
That is a very rare person.
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Fleet Mechanic
Joined: Jul 2010
Posts: 1,753
Likes: 34
From: Los Angeles, Ca.
Well I do understand that it will have the potential to use more fuel and make more heat, and that'll be up to me to control with the loud pedal. My logic is that at the same speed & load it should use the same amount of fuel per mile and have the same EGT before/after modding, but the overwhelming opinion here is that it'll use more all the time no matter what. While it makes no sense to me, I can't argue because I've never done it and tested the outcome and hope to find someone who actually has some before/after data. There may be something about the injection profile that would go against my simple more fuel only at more power theory and I don't know that there isn't.
I'm still hoping to read some test info from anyone who knows.
I'm still hoping to read some test info from anyone who knows.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
If you drive the same speeds with the same loads, adjusting the max fuel setting will have no effect on mileage or EGT.
But as soon as you go faster or haul more, fuel useage will increase.
I don't know of anyone that has turned the fuel up and not wound up lowering the fuel mileage with increased EGT's.
There are possible instances where it would be possible, but you would have to drive exactly right.
IE, just a little more fuel let's you pull a hill in fourth instead of dropping to third to drag yourself over.
The excact terrain you drive in, and the speed you are running has a bigger inpact on fuel mileage than the equipment does.
The only concrete advice I can give on this, black smoke is wasted fuel from not enough air for complete combustion.
If you get black smoke now, you already have more fuel than you can burn completely.
If you can get none, then a little more fuel might wake your truck up a bit.
But if you get into overfuel and the black starts, you just have to back out of the throttle.
Also being in L.A., more fuel may affect you ability to pass emissions since the snap test will result in more black.
But as soon as you go faster or haul more, fuel useage will increase.
I don't know of anyone that has turned the fuel up and not wound up lowering the fuel mileage with increased EGT's.
There are possible instances where it would be possible, but you would have to drive exactly right.
IE, just a little more fuel let's you pull a hill in fourth instead of dropping to third to drag yourself over.
The excact terrain you drive in, and the speed you are running has a bigger inpact on fuel mileage than the equipment does.
The only concrete advice I can give on this, black smoke is wasted fuel from not enough air for complete combustion.
If you get black smoke now, you already have more fuel than you can burn completely.
If you can get none, then a little more fuel might wake your truck up a bit.
But if you get into overfuel and the black starts, you just have to back out of the throttle.
Also being in L.A., more fuel may affect you ability to pass emissions since the snap test will result in more black.
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Fleet Mechanic
Joined: Jul 2010
Posts: 1,753
Likes: 34
From: Los Angeles, Ca.
Thank you, what you say is pretty much what I was guessing at.
I think this van is test exempt, will know for sure when I go do the transfer. It makes no visible smoke at all, I've tried. The boat I'll be hauling is about 8k, and tho I always tow with patience I'd rather pull a hill torquing through D than winding in 2nd when possible. Then there's those merging moments where a little power can make life so much easier and dent-free
I think this van is test exempt, will know for sure when I go do the transfer. It makes no visible smoke at all, I've tried. The boat I'll be hauling is about 8k, and tho I always tow with patience I'd rather pull a hill torquing through D than winding in 2nd when possible. Then there's those merging moments where a little power can make life so much easier and dent-free
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