Need to change out the fuel pump

[agrich2]

I have a 99 Ranger 3.0L Flex Fuel. However, last year I dropped a brand new engine in it from a 2007 (short block). Still running the same intake and all the rest of the engine is from the old engine. I need to replace the fuel pump since it has 215K on it!
I remember reading at one time there is an upgrade you can do for the fuel pump from a Taurus?
What model do I get for higher pressure pump. I see the most people are leaning towards staying with a Motorcraft pump (OEM).
What year does the better pump come from?

Thanks,
Aden

 

[Rearanger]

Why do you want higher pressure?

 

[agrich2]

Fuel Pump

Some people are claiming better fuel atomization and more MPG??

Do know if that is true or not.....
However, I figured I'd asked now before I tear into it.

Thanks,
Aden

 

[Rearanger]

Do know if that is true or not.....

No I don't. But general flow characteristics (not just auto fuel) means higher flow with higher pressure differential. You may cause a rich condition if the higher pressure means richer fuel pulses due to higher pressure. I would say you're best bet would be to get the OEM fuel pressure it was designed for.

Maybe one of the techs here can give you a better experienced answer.

 

[NIPs]

High pressure does create better fuel atomization but if ur gona do it up grade the coils, plugs, and wires, as well as fuel injectors

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[Rearanger]

High pressure does create better fuel atomization but if ur gona do it up grade the coils, plugs, and wires, as well as fuel injectors

Why would it not increase flow? Upgrade injectors to what? How much benefit for the cost?

 

[NIPs]

Its all about how much is the person willing to spend, diesels at injectors are at 50,000psi some are more just depends, ur average gasoline engine puts 50-60psi at start up, cruise speeds mayb 20psi-40psi, the finer the mist the better the burn becuz the more air mixes with more fuel molecules the better perfect combustion on an engine is 14.7-1 that 14.7 aired molecules to 1 molecules fuel

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[NIPs]

Ur average tuned diesel engine in say a Volkswagen tdi will get 50mpgs becuz of that fine fuel atomization

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[NIPs]

Agrich2 where ru from

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[Rearanger]

Its all about how much is the person willing to spend, diesels at injectors are at 50,000psi some are more just depends, ur average gasoline engine puts 50-60psi at start up, cruise speeds mayb 20psi-40psi, the finer the mist the better the burn becuz the more air mixes with more fuel molecules the better perfect combustion on an engine is 14.7-1 that 14.7 aired molecules to 1 molecules fuel

How does that help the OP? He's not running diesel. Diesels run in far excess of 14:1. The AFR is by weight not by molecules. So, a lower pressure system is not getting 14.7:1?

 

[JP02XLT]

Fuel pressure does not decrease at cruise or any other condition on a fuel injected engine while its running, if it does you have a pump or regulator issue.

As for higher pressure, on a correctly functioning injector it can actually cause them to hang a bit in their cycle and cause a poor spray pattern. Same situation with a weak pump, which can be failing in pressure or volume & will cause very poor spray patterns on injectors. I am not saying you cant raise rail pressure, just if you do you almost need a flow / spray pattern bench to see the results.

Higher psi pumps, or more importantly pumps that have higher volume capabilities for higher horsepower applications is what I believe the OP is looking for. Is there a Taurus upgrade, I dont know for sure, but since Ford put the 24v Duratec in some Taurus's they may have upgraded the pump, will it directly bolt into your tank? again not sure. Might be worth a look into the part numbers for 3.0 vs the Duratec option.

I did a pump upgrade on my truck for the larger injectors and used a 175 walbro unit, I had to dissemble the fuel cartridge unit and replace the stock pump with the 175, while not an exact direct fit it did go together with a little re-engineering and works just fine, I normally see 58-60 psi and with a rising rate regulator, FP increases with every 2 psi of boost accordingly, so @ 18 psi of boost I see 68 - 72 psi of fuel pressure all due to demand.

Pressure alone has very little to do with A/F ratios, I have a Chevy TBI truck that has 62lb injectors in it that run at 25-28 psi & it maintains the 14.6 - 14.8 range on the wide band almost all the time except for WOT where it richens accordingly.

Diesel & Gasoline are 2 totally different animals, not only in injector pressure, but cylinder pressures and timing events due to the volatility & the compress ability of the difference in the fuels.

As for the brand of fuel pumps it has been my experience to avoid the low cost no-names, they fail pretty much just after the warranty, Delphi, Motorcraft, BG, Walbro, BK, Echlin, all seem to be good quality products from my personal experience.

JP02XLT

 

[NIPs]

Fuel pressure does not decrease at cruise or any other condition on a fuel injected engine while its running, if it does you have a pump or regulator issue.

As for higher pressure, on a correctly functioning injector it can actually cause them to hang a bit in their cycle and cause a poor spray pattern. Same situation with a weak pump, which can be failing in pressure or volume & will cause very poor spray patterns on injectors. I am not saying you cant raise rail pressure, just if you do you almost need a flow / spray pattern bench to see the results.

Higher psi pumps, or more importantly pumps that have higher volume capabilities for higher horsepower applications is what I believe the OP is looking for. Is there a Taurus upgrade, I dont know for sure, but since Ford put the 24v Duratec in some Taurus's they may have upgraded the pump, will it directly bolt into your tank? again not sure. Might be worth a look into the part numbers for 3.0 vs the Duratec option.

I did a pump upgrade on my truck for the larger injectors and used a 175 walbro unit, I had to dissemble the fuel cartridge unit and replace the stock pump with the 175, while not an exact direct fit it did go together with a little re-engineering and works just fine, I normally see 58-60 psi and with a rising rate regulator, FP increases with every 2 psi of boost accordingly, so @ 18 psi of boost I see 68 - 72 psi of fuel pressure all due to demand.

Pressure alone has very little to do with A/F ratios, I have a Chevy TBI truck that has 62lb injectors in it that run at 25-28 psi & it maintains the 14.6 - 14.8 range on the wide band almost all the time except for WOT where it richens accordingly.

Diesel & Gasoline are 2 totally different animals, not only in injector pressure, but cylinder pressures and timing events due to the volatility & the compress ability of the difference in the fuels.

As for the brand of fuel pumps it has been my experience to avoid the low cost no-names, they fail pretty much just after the warranty, Delphi, Motorcraft, BG, Walbro, BK, Echlin, all seem to be good quality products from my personal experience.

JP02XLT

Fuel pressure does decrease, a hook pressure gauge up to a Ford Taurus and watch it jump down when u step on it according to Ford and alldata, 20psi to 30psi is normal operating at 2000rpm, and 60Psi or so on start up

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[Rearanger]

Fuel pressure does not decrease at cruise or any other condition on a fuel injected engine while its running, if it does you have a pump or regulator issue.

As for higher pressure, on a correctly functioning injector it can actually cause them to hang a bit in their cycle and cause a poor spray pattern. Same situation with a weak pump, which can be failing in pressure or volume & will cause very poor spray patterns on injectors. I am not saying you cant raise rail pressure, just if you do you almost need a flow / spray pattern bench to see the results.

Higher psi pumps, or more importantly pumps that have higher volume capabilities for higher horsepower applications is what I believe the OP is looking for. Is there a Taurus upgrade, I dont know for sure, but since Ford put the 24v Duratec in some Taurus's they may have upgraded the pump, will it directly bolt into your tank? again not sure. Might be worth a look into the part numbers for 3.0 vs the Duratec option.

I did a pump upgrade on my truck for the larger injectors and used a 175 walbro unit, I had to dissemble the fuel cartridge unit and replace the stock pump with the 175, while not an exact direct fit it did go together with a little re-engineering and works just fine, I normally see 58-60 psi and with a rising rate regulator, FP increases with every 2 psi of boost accordingly, so @ 18 psi of boost I see 68 - 72 psi of fuel pressure all due to demand.

Pressure alone has very little to do with A/F ratios, I have a Chevy TBI truck that has 62lb injectors in it that run at 25-28 psi & it maintains the 14.6 - 14.8 range on the wide band almost all the time except for WOT where it richens accordingly.

Diesel & Gasoline are 2 totally different animals, not only in injector pressure, but cylinder pressures and timing events due to the volatility & the compress ability of the difference in the fuels.

As for the brand of fuel pumps it has been my experience to avoid the low cost no-names, they fail pretty much just after the warranty, Delphi, Motorcraft, BG, Walbro, BK, Echlin, all seem to be good quality products from my personal experience.

JP02XLT

That's a much better explanation.

The OP stated he wants higher MPG and for sure better atomization may do that along with lower emissions, but I'm doubting he'll get it. I have to believe that higher pressures alone are not going to achieve it. It must also be pintle design. If higher pressures are not producing a richer mixture the injector open dwell time must be adjusting to compensate.

I doubt he'll achieve much when weighed against the cost and tweaking experimentation he'll have to do with probably some time and money spent at a tuning shop.

 

[NIPs]

Think about it like this ur house water pressure if live in the city is about 40-60 psi(I know this becuz I was plumber for a couple years) go turn on ur hose without any attachments on the end and its a pretty consistent rate of water now put ur thumb over the end u just increased the end pressure which will create a fine spray on one side that ur thumb didnt cover and the other side is a jet, now relate to fuel increase the fuel pump pressure increase flow, which will increase the pressure at the injectors will create a finer spray pattern which is what u want ull gain more power, mayb mpgs hard to say

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[NIPs]

I pulled this off a site talking about direct injection which more manufacturers are starting to go to for better fuel economy they were talking about gasoline engines just we dont get any confusion and nobody has to ask

Fuel Apply Rate
The fuel apply rate is tuned via the pressure in the common fuel rail that the fuel injectors are connected to, the number of times the injector is opened to allow fuel to pass through it (during the intake cycle), and the duration of those openings. DI fuel systems are substantial in their design because they usually generate and hold fuel pressurized at a whopping 2,200 psi or more (the DI fuel rail tube often has about a 1/8-inch wall thickness to handle these extreme pressures) rather than the 40 to 60 psi common in port injection. These extremely high pressures allow the injector to flow enough fuel to achieve stoichiometric combustion (the desired 14:1 ratio of fuel and air) in a little less than half the number of degrees of crank rotation as compared with a port fuel injection engine.

Here is the explanation of that statement: The injectors on a port fuel injection engine can flow fuel for almost the entire 720 degrees of crank rotation (at lower rpm they close occasionally, but at higher rpm they can be open for as long as 720 degrees). This is acceptable as the fuel/air mixture filling the intake ports only flows into the combustion chambers when the intake valve is open.



Read more:*http://www.hotrod.com/techarticles/engine/hrdp_0909_direct_injection_guide/#ixzz34QCmLzeH

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