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06-21-2010, 12:32 PM
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#1
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3 Rivet Member
1990 33' Land Yacht
Jacksonville
, Florida
Join Date: Apr 2006
Posts: 112
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Water separator / fuel filter for gas motor home
I have been chasing an intermittent loss of power and miss in my 1990 Airstream LY, equipped with the Chevrolet 7.4L TBI engine.
I have narrowed the problem down to the poor quality ethanol/gas being sold nowadays as a result of federal stupidity (but that is another subject for another soapbox -- please don't get me started!).
When I bought the MH in 2006, real gas was readily available, and I was satisfied with the MHs performance.
Now I am not!
Here is my question, aside from using Stabil Blue, will a fuel filter/water separator help me regain some measure of performance?
I know that diesel engines all have water separator/fuel filters -- anybody out there have one installed on their gas rig?
If so, did it work?
What brand?
Thanks in advance.
__________________
Frank and Susan Davis
Jacksonville, Florida
33' 1990 Airstream Land Yacht: Edelbrock, Banks, Gear Vendors, MSD, Taylor wires, Super Steer bell cranks, Bilsteins, Roadmaster sway bar, Safe Steer, Pressure Pro, Crossfire, Bigfoot levelers, Rickson 7.5" rims & 245/70 R19.5 Bridgestones on steer axle.
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06-21-2010, 01:18 PM
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#2
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Rivet Master
1967 26' Overlander
Huntsville
, Alabama
Join Date: Dec 2003
Posts: 3,018
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I've just recently been there
Quote:
Originally Posted by Taxman
I have been chasing an intermittent loss of power and miss in my 1990 Airstream LY, equipped with the Chevrolet 7.4L TBI engine... I have narrowed the problem down to the poor quality ethanol/gas being sold nowadays ...
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For various reasons, I do not think a water separator will cure your engine's ills. The addition of one, though, will certainly will not hurt anything.
FWIW, my 7.4L recently gave me very similar trouble & I had drawn a similar conclusion. You can read the tale of what appears to be a successful repair at this link.
Tom
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06-21-2010, 01:55 PM
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#3
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Rivet Master
1978 31' Sovereign
Texas Airstream Harbor
, Zavalla, in the Deep East Texas Piney Woods on Lake Sam Rayburn
Join Date: Jan 2003
Posts: 2,435
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Fuel Pressure????
AS MH's are notorious for losing fuel pressure -
Install and check the fuel pressure going into the carb (or FI system) prior to going any further....
There should be an "intermediate" fuel pump on your system (I think).
The primary electric fuel pump (and maybe the secondary) are controlloed by an oil pressure contact switch on the curb side of the engine....
Do a search on your problems here on the forums - balky fuel systems have been covered many, many times before.
__________________
Dennis
"Suck it up, spend the bucks, do it right the first time."
WBCCI # 1113
AirForums #1737
Trailer '78 31' Sovereign
Living Large at an Airstream Park on the Largest Lake Totally Contained in Texas
Texas Airstream Harbor, Inc.
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06-21-2010, 03:57 PM
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#4
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Rivet Master
1969 31' Sovereign
Broken Arrow
, Oklahoma
Join Date: Jan 2003
Posts: 1,455
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I have the same engine and it runs OK on the political gas.
I have a water separator in my boat but don't need one in the RV.
Sounds more like a fuel filter problem the engine should run fine on 87 octane if everything else is in good order like plug wires and such.
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Garry
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06-22-2010, 07:32 AM
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#5
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3 Rivet Member
1990 33' Land Yacht
Jacksonville
, Florida
Join Date: Apr 2006
Posts: 112
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Tom,
Thank you for responding -- I'll certainly check out that possibility.
Safe travels,
FRank
__________________
Frank and Susan Davis
Jacksonville, Florida
33' 1990 Airstream Land Yacht: Edelbrock, Banks, Gear Vendors, MSD, Taylor wires, Super Steer bell cranks, Bilsteins, Roadmaster sway bar, Safe Steer, Pressure Pro, Crossfire, Bigfoot levelers, Rickson 7.5" rims & 245/70 R19.5 Bridgestones on steer axle.
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06-22-2010, 07:35 AM
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#6
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3 Rivet Member
1990 33' Land Yacht
Jacksonville
, Florida
Join Date: Apr 2006
Posts: 112
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Dennis,
Thank you for your suggestions -- all have been previously checked, to no avail.
I really believe that since I have do not drive my MH every few weeks, that the gas goes bad and causes the misfire problem.
Safe travels,
FRank
__________________
Frank and Susan Davis
Jacksonville, Florida
33' 1990 Airstream Land Yacht: Edelbrock, Banks, Gear Vendors, MSD, Taylor wires, Super Steer bell cranks, Bilsteins, Roadmaster sway bar, Safe Steer, Pressure Pro, Crossfire, Bigfoot levelers, Rickson 7.5" rims & 245/70 R19.5 Bridgestones on steer axle.
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06-22-2010, 07:40 AM
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#7
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3 Rivet Member
1990 33' Land Yacht
Jacksonville
, Florida
Join Date: Apr 2006
Posts: 112
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Garry,
Thanks.
As I mentioned, I have checked and double checked every possibility -- gonna try Stabil-Blue and fresh premium gas, after I change the fuel filter.
I got the idea for a water separator/fuel filter from a marine site -- the theory that boat engines are run infrequently fits the pattern of my MH usage.
Safe travels,
FRank
__________________
Frank and Susan Davis
Jacksonville, Florida
33' 1990 Airstream Land Yacht: Edelbrock, Banks, Gear Vendors, MSD, Taylor wires, Super Steer bell cranks, Bilsteins, Roadmaster sway bar, Safe Steer, Pressure Pro, Crossfire, Bigfoot levelers, Rickson 7.5" rims & 245/70 R19.5 Bridgestones on steer axle.
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06-22-2010, 07:41 AM
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#8
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3 Rivet Member
1990 33' Land Yacht
Jacksonville
, Florida
Join Date: Apr 2006
Posts: 112
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Garry,
PS What kind of water separator do you have in your boat?
__________________
Frank and Susan Davis
Jacksonville, Florida
33' 1990 Airstream Land Yacht: Edelbrock, Banks, Gear Vendors, MSD, Taylor wires, Super Steer bell cranks, Bilsteins, Roadmaster sway bar, Safe Steer, Pressure Pro, Crossfire, Bigfoot levelers, Rickson 7.5" rims & 245/70 R19.5 Bridgestones on steer axle.
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06-22-2010, 09:14 AM
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#9
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Rivet Master
1978 31' Sovereign
Texas Airstream Harbor
, Zavalla, in the Deep East Texas Piney Woods on Lake Sam Rayburn
Join Date: Jan 2003
Posts: 2,435
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Quote:
Originally Posted by Taxman
Dennis,
Thank you for your suggestions -- all have been previously checked, to no avail.
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Frank:
I still think you have a fuel pressure problem -
What I failed to type in my previous post was a recommendation to install a fuel pressure meter just upstream of your carb/throttle body/FI take point.
The slightly older 345's and 325's are famous for one or more electric fuel pumps failing (or partially failing) and causing a vapor lock condition.
A fuel pressure meter is relatively cheap and easy to install - as is a supplementary electric fuel pump located close to the fuel tank.
__________________
Dennis
"Suck it up, spend the bucks, do it right the first time."
WBCCI # 1113
AirForums #1737
Trailer '78 31' Sovereign
Living Large at an Airstream Park on the Largest Lake Totally Contained in Texas
Texas Airstream Harbor, Inc.
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06-22-2010, 10:28 AM
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#10
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Tom, the Uber Disney Fan
2006 30' Safari
Orlando
, Florida
Join Date: Aug 2004
Posts: 4,693
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Have you tried manually draining your gas tank to remove any water that might be in it? Water is heavier than gasoline and therefore would stay at the lowest point in the tank. This is also the point the contents of the tank are drawn out into the fuel lines. You might also try checking for possible points of moisture entry into the tank. Just a thought.
__________________
2006 30' Safari - "Changes in Latitudes"
2008 F-250 Lariat Power Stroke Diesel Crew Cab SWB
Family of Disney Fanatics
WBCCI# 4821
https://streaminacrossamerica.com/
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06-22-2010, 11:21 AM
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#11
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_
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, .
Join Date: Dec 2004
Posts: 8,812
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while a water issue is always possible, and perhaps DRAINING the fuel tank 1 time is a sensible idea...
and stale gas might be an issue sometimes in some settings (stall gas is a VERY over used excuse for issues...)
but then the question becomes for LONG TERM inactivity is a FULL TANK or empty tank better...
i dunno and neither does ne1 else.
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87mh is spot ON, on this issue.
and WAY before universal reformulated gasoline,
a/s moho owners were dealing with the mystery and many faces of vapor lock.
IF you haven't fully evaluated the fuel pump/s and pressure and gas line RUNS (for heat exposure) ...
vapor lock is STILL the most likely problem.
_________
you've not described WHAT exactly is happening or HOW the bad fuel conclusion was reached...
so we've got nuthing to go on in the armchair mechanics corner...
but PREMIUM fuel isn't gonna solve any problems in these relatively low compression engines.
cheers
2air'
__________________
all of the true things that i am about to tell you are shameless lies. l.b.j.
we are here on earth to fart around. don't let anybody tell you any different. k.v.
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06-25-2010, 03:57 PM
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#12
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Rivet Master
1969 31' Sovereign
Broken Arrow
, Oklahoma
Join Date: Jan 2003
Posts: 1,455
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My fuel separator looks just like a standard screw on oil filter and I change it out once per year.
I think I bought it at Boaters World very easy to install and replacement filters are not expensive.
__________________
Garry
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06-25-2010, 04:17 PM
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#13
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Rivet Master
1968 24' Tradewind
Oxford,
, Mississippi
Join Date: May 2009
Posts: 1,564
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Etoh (ethanol) in gas is huge problem for boaters. I was having terrible problem with my Mariner 150 until I started adding Startron to the fuel. It is an enzyme product that is keeps the Etoh from separating from the gasoline. Etoh is a much bigger problem in tanks that are vented to the outside (like boat tanks) and yours may not be vented. Etoh is very hygroscopic and the longer fuel sits the more chance of absorbing water from the atmosphere. The Startron prevents this. They are also just started making an Etoh formulation of a product called Sea Foam. I have used it for years to dry gas and clean fuel systems in small engines and 4-wheelers with great success. The new formula is supposed to do the same with fuels containing Etoh.
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06-25-2010, 05:57 PM
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#14
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Rivet Master
Commercial Member
Vintage Kin Owner
Naples
, Florida
Join Date: Dec 2005
Posts: 7,508
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Quote:
Originally Posted by 68 TWind
Etoh (ethanol) in gas is huge problem for boaters. I was having terrible problem with my Mariner 150 until I started adding Startron to the fuel. It is an enzyme product that is keeps the Etoh from separating from the gasoline. Etoh is a much bigger problem in tanks that are vented to the outside (like boat tanks) and yours may not be vented. Etoh is very hygroscopic and the longer fuel sits the more chance of absorbing water from the atmosphere. The Startron prevents this. They are also just started making an Etoh formulation of a product called Sea Foam. I have used it for years to dry gas and clean fuel systems in small engines and 4-wheelers with great success. The new formula is supposed to do the same with fuels containing Etoh.
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As I was reading down this thread, my thoughts turned to motorcycles and the problems I have been having with missing, power loss and poor fuel mileage. (My trucks and van are all diesel).
My shop is upstairs from a big marine service shop, and they also recommended Startron. They use tons of the stuff in their customer's boats. The stuff performs EXACTLY as they say. Better mileage, smoother running....a noticeable difference for sure. I buy it by the case now!
__________________
lewster
Solar Tech Energy Systems, Inc.
Victron Solar Components and Inverters, Zamp Solar Panels, LiFeBlue and Battle Born Lithium Batteries, Lifeline AGM Batteries
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03-21-2011, 08:55 PM
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#15
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2 Rivet Member
1997 30' Cutter Bus (Ford)
grosse pointe
, Michigan
Join Date: Jun 2008
Posts: 28
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make sure your tank is ok. i had numerous problems with power issues. resolved after tank was replaced. tank rotted.
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