Simple test for you John. Boil a quart of water then pour a cup of ice water into and measure the temp. Now boil a cup of water and pour a quart of ice water into it and take its temperature. Besides spilling water everywhere, I'm betting the latter will be cooler than the former.
David Just rolling along enjoying life w/F53 Southwind towing a 87 Samurai or 01 Grand Vitara looking to golf or fish Simply Despicable Any errors are a result of CRS.
Don't get me wrong guys, I do enjoy this as a backyard mechanic debate (wish we all could be having a cool one around a campfire though to help out our thinking process ,) but I'm still not buying it.
20 gallons of gas should be more then enough to cool the pump under all conditions (most passenger vehicles have much smaller tanks.) In my mind the pump is not working any harder in a MH then a passenger vehicle. The return line is proof of that (what doesn't get used gets recycled back to the tank.)I could even debate that the 30+ feet of return line in a MH is acting as a cooling coil (but that would require us all to have another cool one while we pondered that )
So far I've been running my tank to 1/4 (sometimes even less if I have too) for the last 4 years when we're snowbirding with no ill effects. Pulling into a station every 200 miles (1/2 tank - my range with my rig) pulling a car becomes a major PITA when you're in unknown territory. That extra 1/4 tank gives me another 100-150 miles before I need to fuel up. Over the course of six months that can cut out a few fill ups for me and the possiblity of getting all cock-eyed in some of these gas stations you find in different parts of the US.
Now if I used my rig to go to a favorite campground 100 miles away for the weekend, then back to home turf while not pulling a car, then I would more then likely fill the tank up when I got back to home turf and my known home gas station. So I would never run below 1/2 tank just to be extra safe making this a mute point for me. Oh man that might need a cold one also, the idea that we all use our rigs differently which shapes the way we think on this topic.
I don't think folks are getting the point. If the tank has 20 gallons but the fuel depth is so shallow that only 1/4 of the pump is submerged, the pump will get hotter than a tank with 20 gallons and the pump fully submerged.
Since RV tanks are a lot larger that car tanks, 20 gallons in an RV tank may only be 1" deep but the same 20 gallons in a smaller car tank might be 8" deep.
It's not the gallons but the submerging of the pump that provides the cooling.
At any rate, I heard it's not a cooling issue anyway but the alcohol in the gas causing the plastic parts of the fuel pump to swell and bind that kills the pumps.
2008 Fleetwood Jamboree 25G
1999 Jeep Wrangler
100% Solar Powered Home
When seconds count, the police are only minutes away.
All I know is that my Ford 460 in my Tioga has quit three times, everytime on a hot day. After sitting for a while, it will start and run just fine. If I fill the tank with cold fuel, it will start sooner and run a long time.
I have been told it is "hot fuel syndrome", and it is very common with Ford 460 powered motorhomes and vans.
My fuel pressure has been tested, and the filter changed.
To minimize the problem, I plan to fill with fuel from underground tanks (cold fuel) at 150 to 200 miles. Hopefully, that will keep the fuel at an "operating temperature".
If it is an alcohol problem, the manufacturer of the pumps needs to step up and build ones that are compatible!
If it really IS a "hot fuel syndrome", somebody needs to fabricate and sell a "Fuel cooler" of some kind to eliminate the problem!
It is quite asinine that our high-tech society has problems like this!
CM1, USN (RET)
2002 Fleetwood Southwind 32V, Ford V10
Toad: 2006 Jeep Rubicon LJ
Other toad: '06 PT Cruiser, Kar Kaddy dolly
Toy: 1977 Dodge W100 CC SWB, 3/4 ton axles & springs
"When seconds count, help is only minutes away!"
First post from an RV'er. I bought 91 Fleetwood Southwind 30' Ford 454 F53 when I was 37 years old. 8 years and 63K miles later, I diagnosed fuel pump failure while still on my driveway. VERY LUCKY indeed. I just replaced the fuel pump after I dropped the tank. Thanks to Jerry's info.
I used a floor jack and 2 tie down straps to lower the EMPTY tank. It has to be tilted to the right when lowering due to the filler neck hitting the frame rail. After it is lowered past the frame, just lower the rear strap so it will be tilted to the rear. From there it is just a piece of cake. Replaced the fuel pump from O'Reilly's Auto part Airtex - Electric Fuel Pump
Part # E2490 and strainer $126.00 which can be used on a 91 to 99 Taurus and Windstar ...
Replaced the intake filler fuel line and breather line for $30.00.
4 trips to the gas station with a 5 gallon container and it started right away !!!!!!!!!!!!!! Sad part is : full tank of gas $280.00. I almost went into my 401K for cash. But wife and 5 kids are very supportive so, I think it will be another happy years to go with the RV. I rather do it myself with this old RV than to pay the "Stealer" for $500.00 + for pump only.
Thanks to all who posted the HOW TO... and thanks to Jerry again.
Happy trails to all of you.
* This post was
edited 05/27/12 11:50am by FrwyCop *
JUST A CAUTIOUS REMINDER: VAPOR LOCK WITH FORD F53 7.5L 460
Ford F53 chassis built before 7/1/97 have the old style GEROTOR FUEL PUMP/SENDER ASSEMBLY. If you choose to replace only the pump with a new pump you are installing another old style GEROTOR pump. Less costly.
If you want the new style TURBINE PUMP you must replace the complete fuel pump/sender assembly and use the jumper harness required for the build date of your chassis. Higher cost but you are less likely to experience vapor lock problems again. A separate ground is used for the pump and sender and the pump is spring loaded to the bottom of your fuel tank.
If you already have a TURBINE PUMP/SENDER ASSEMBLY a replacement pump is also available.
* This post was
edited 05/27/12 03:38pm by dsbsi *
1995 Ford F53 Bounder 35U
Cold Spring Minnesota
Relative to the half tank, full tank issue, remember the pump is cooled by the fuel passing thru it. Additionally, you can use the same pump mounted on the side rail without fuel submersion and it works fine. Been there done that.