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Fuel Temperature

xmtysonxm
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xmtysonxm

xmtysonxm

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Where does the EJWA pick up the fuel temperature? I hadn't driven my truck for 2 days and went to start it up this morning. It was 32 degrees outside and the fuel temp was showing 41 degrees.  After a few mins of idle and scraping the windows I started driving and the temp was showing 64 degrees.  Is this read from the fuel in the VP44?

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Cronus577

Cronus577

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On 11/22/2016 at 5:42 AM, xmtysonxm said:

Where does the EJWA pick up the fuel temperature? I hadn't driven my truck for 2 days and went to start it up this morning. It was 32 degrees outside and the fuel temp was showing 41 degrees.  After a few mins of idle and scraping the windows I started driving and the temp was showing 64 degrees.  Is this read from the fuel in the VP44?

Correct, the fuel temp sensor is located in the VP44

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  • 3 years later...
CUMMINSDIESELPWR

CUMMINSDIESELPWR

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7 hours ago, LorenS said:

What is a normal fuel temp rolling down the interstate at 75, unloaded? Quad showing 140! Full tank of fuel, 84 outside. Lift pump at 11 psi. IAT 122. Quad on fuel economy level 2.

what lift pump do you have? appears that the fuel in the VP is not being recirculated keeping it cool. i suspect stock/oem lift pump on side of block?

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LorenS

LorenS

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Posted

It's the stock style, but moved to frame rail.  The fuel that's used to cool is after the positive displacement rotary vane pump, right? It could be that fuel return is not occurring as you say, but it'll take some real solid explanation to convince me 12 PSI at the VP inlet isn't sufficient.

 

The stock return flow is into the same vicinity as the fuel pickup, nice in winter, maybe not so nice in summer.

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Mopar1973Man

Mopar1973Man

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8 hours ago, LorenS said:

What is a normal fuel temp rolling down the interstate at 75, unloaded? Quad showing 140! Full tank of fuel, 84 outside. Lift pump at 11 psi. IAT 122. Quad on fuel economy level 2.

 

Not enough volume of fuel... 

 

My truck the IAT and Fuel Temp are the same. Typically lately its about 112*F max. Still running the 4G AirDog 165 pump on the 2G AirDog 150 base.  Full 1/2 inch plumbing from tank to injection pump.

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NIsaacs

NIsaacs

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Posted
8 hours ago, LorenS said:

What is a normal fuel temp rolling down the interstate at 75, unloaded? Quad showing 140! Full tank of fuel, 84 outside. Lift pump at 11 psi. IAT 122. Quad on fuel economy level 2.

 

That seems normal to me. Keep in mind the VP is bolted to the 180-190*+ engine block.

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Mopar1973Man

Mopar1973Man

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7 minutes ago, NIsaacs said:

 

That seems normal to me. Keep in mind the VP is bolted to the 180-190*+ engine block.

 

Not normal, really. Actually high... Even with 201*F coolant, 175*F engine oil temperature, my VP44 fuel temp is only 84*F. This is even cruising at 82 MPH down the interstate. Just for me to reach the I84 interstate is a 2.5 hour drive for me. Truck is fully warmed up after 125 mile trip.

 

Capture+_2019-12-31-11-32-09.png

 

 

Edited by Mopar1973Man
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LorenS

LorenS

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Posted

@Mopar1973ManHoly smokes how do you get more gauges to show up?! Also, can't even imagine blowing down the road over 2,500 RPM.

 

Is there any chance my fuel heater would be stuck on? I didn't mention it, but my voltage was 13.6, which is atypical for my truck. Normally in the 14.4 vicinity. 

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Mopar1973Man

Mopar1973Man

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Just unplug the fuel heater.

 

9 minutes ago, LorenS said:

Also, can't even imagine blowing down the road over 2,500 RPM.

Best setup yet with 30.5 Inch tires. These get the final ratio down to 3.69:1 to the road and awesome for towing. Never once did I have a EGT issue all the way to Arizona also towing my 31 foot RV. Even with 7% grades, cruise set for 65 MPH, EGTs land right at 1,000 to 1,100*F and the Quadzilla on my tow tune and set for KILL! Even empty running at 82 MPH at 2,500 RPM I still can hit 21 MPG. On that trip was 14.7 MPG Max, 12.6 MPG Avg, low was 9.6 MPG.

 

15915332979951430079351958718559.jpg

 

Again this is because I gave up drag of larger tires and opted for smaller tires for lower ratio which lessen drag on the engine. So my normal daily driving I land right at 2,000 RPM at 66 MPH. Very optimal for daily driving here in the mountains. I'm use to seeing 500*F to 600*F EGT's around 60 to 65 MPH stuff.  Then my average engine load on flat ground 82 MPH is about 25% engine load. Look above it was only 22% engine load. Boost is like 5 to 7 PSI at 82 MPH!!! Look above the EGT's was a mere 683*F at 82 MPH.

Edited by Mopar1973Man
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Mopar1973Man

Mopar1973Man

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Posted (edited)

245/70 R17 would be the same as my 245/75 R16 I'm running. 31.6 inch tire (265/75 R16) is the neutral point of 3.55:1 final ratio. 

 

265/75 R16 is same as 265/70 R17. 

 

245/75 R16 is the same as 245/70 R17 this makes the final ratio 3.68:1. If you can barrow a set of 245's for a test run you'll see what I mean.

 

Also... 215/85 R16 is what I run on the 1996 Dodge 1500. Which is just like the 245/75 R16 for 30.6 inches but narrow tires. This gave that truck huge boost in power and made it quicker. 3.70:1 final ratio. Then a Dynamic Built transmission to the upgrades too.

Edited by Mopar1973Man
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NIsaacs

NIsaacs

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Posted
10 hours ago, Mopar1973Man said:

 

Not normal, really. Actually high... Even with 201*F coolant, 175*F engine oil temperature, my VP44 fuel temp is only 84*F. This is even cruising at 82 MPH down the interstate. Just for me to reach the I84 interstate is a 2.5 hour drive for me. Truck is fully warmed up after 125 mile trip.

 

Capture+_2019-12-31-11-32-09.png

 

 

 

That's normal temps for my truck, however, it is always towing at least an empty dump trailer (15280 lbs). 140* is a little high for hauling groceries. I don't have a typical, it varies by ambient temps, tank level and hours driven. Mine will vary just by the fuel stations storage, above ground or underground.

 

That screen shot 84* fuel temp tells me it was dead of winter, like 0* ambient, not exactly typical.

10 hours ago, Mopar1973Man said:

Just unplug the fuel heater.

 

Best setup yet with 30.5 Inch tires. These get the final ratio down to 3.69:1 to the road and awesome for towing. Never once did I have a EGT issue all the way to Arizona also towing my 31 foot RV. Even with 7% grades, cruise set for 65 MPH, EGTs land right at 1,000 to 1,100*F and the Quadzilla on my tow tune and set for KILL! Even empty running at 82 MPH at 2,500 RPM I still can hit 21 MPG. On that trip was 14.7 MPG Max, 12.6 MPG Avg, low was 9.6 MPG.

 

15915332979951430079351958718559.jpg

 

Again this is because I gave up drag of larger tires and opted for smaller tires for lower ratio which lessen drag on the engine. So my normal daily driving I land right at 2,000 RPM at 66 MPH. Very optimal for daily driving here in the mountains. I'm use to seeing 500*F to 600*F EGT's around 60 to 65 MPH stuff.  Then my average engine load on flat ground 82 MPH is about 25% engine load. Look above it was only 22% engine load. Boost is like 5 to 7 PSI at 82 MPH!!! Look above the EGT's was a mere 683*F at 82 MPH.

 

12.6 mpg average, towing  17,300 gcw with 30" tires is not that special for these trucks. This is a copy and paste from a TDR post with 285/75x16 tires and 19k gcw, towing the Rocky Mountain states. This is with an Edge Juice (level 5) and high mileage RV injectors. 

 

"1228 round trip miles, 102.4 gallons of fuel gives me 11.99 mpg, I can live with that"

 

 

downsized_0722161743a.jpg

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LorenS

LorenS

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15 hours ago, LorenS said:

how do you get more gauges to show up?

The answer is "swipe left". Whoops...

Follow-up question @Mopar1973Man, how does one get the Timing gauge? Is that something you programmed yourself? Now that I'm home from months on the road I'd like to start making small changes to get my timing right. Will move transmission temp sender to oil, I suppose, to follow your recommendations.

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