Reply
 
Thread Tools Search this Thread Display Modes
 
Old 04-26-2014, 09:51 PM   #1
2 Rivet Member
 
1979 24' Airstream Excella 24
Woodland Hills , California
Join Date: Feb 2013
Posts: 90
Images: 6
Electric fuel pump problem

I have a 1979 Airstream 240. 454 v8, gas engine motorhome.
I'm pretty sure the existing electric fuel pump is itermitent and bad.

I don't know what pump pressure rating is needed for this motorhome.

If I went to Pep Boys and asked for and asked for a 79 Chevy P-30 454 v8 compatible electric fuel pump, would they know what I need?

I don't think so, and That is why I am reaching out to the
Airstream community. Does anybody know the best brand? Pressure needed?
etc.

I know the motorhomes came with mechanical pumps, but since the unit has been retrofitted with an electric pump, I think I want to keep it electric.

If I replace it with the same electric pump, I'm left wondering if it is under pressured or over pressured?

Any help would greatly be appreciated.
__________________

__________________
flatouf is offline   Reply With Quote
Old 04-26-2014, 10:29 PM   #2
Rivet Master
 
J. Morgan's Avatar

 
1972 31' Sovereign
1975 31' Excella 500
Currently Looking...
Benton , Arkansas
Join Date: Mar 2013
Posts: 5,046
Images: 11
You need a low pressure pump, one that makes less than 7 psi.

I recommend a Carter P4070.
__________________

__________________
The fact that I am opinionated does not presuppose that I am wrong......

J. Morgan is offline   Reply With Quote
Old 04-26-2014, 10:40 PM   #3
Rivet Master
 
Waipio Rim's Avatar
 
1984 31' Airstream310
Honokaa , Hawaii
Join Date: Jun 2010
Posts: 668
I think that most of us still have the mechanical pump on the motor with an electric pump like the one J. Morgan recommends near the tank to get the fuel to the mechanical pump. Why do you think the pump is bad?
__________________
Waipio Rim is offline   Reply With Quote
Old 04-27-2014, 12:20 AM   #4
Rivet Master
 
1974 Argosy 20
2014 20' Flying Cloud
Kooskia , Idaho
Join Date: Jul 2009
Posts: 4,591
On my '83, 310 when I had it, even the electric rear fuel pump would not push fuel through the in line filter next to the frame rail about mid way, if it were plugged. So, be sure you have a fresh filter, that may be all you need.
__________________
idroba is offline   Reply With Quote
Old 04-27-2014, 10:27 AM   #5
2 Rivet Member
 
1979 24' Airstream Excella 24
Woodland Hills , California
Join Date: Feb 2013
Posts: 90
Images: 6
Hmmm! I knew of the mechanical pump, but did not know it also needs an electric pump as well. So now I know the electric pump is sending fuel to the mechanical pump. I spent some time tracing my fuel line from the tank to the electric pump which is located near my steps, and from there to the engine.
However everything is so cramped for space in the engine compartment, I figured the the fuel line from the electric pump went straight to the carburetor and bypassed the old mechanical pump. Apparently it does go to the mechanical pump.

I do have a toggle switch on my dash to turn on the electric pump.
When I purchased this unit from a fellow Air Forum member, he told me the pump switch is used for climbing grades up hill.


This is the second time this has happened in three months.
It will not start. No sign of fuel at the carburetor.

Previously I removed the electric fuel pump, It was making a continuous loud tap, tap, tap noise. There was maybe a tablespoon or less of fuel in the pump bowl, the filter was clean.
I removed the pump. I took my compressor and placed the air hose nozzle and blew air into the inlet of the pump. then took the air nozzle and blew air into the hose comming from the tank. I did two very very short nano blasts, just to push any possible sediment away from the fuel line at the tank.
Put everything back together and the pump worked, the engine started.

When I started the engine for the first time, the pump was making the loud tap tap tap noise until fuel filled the bowl and sent fuel to the engine, then no more noise.

After the initial first start up it makes the continual loud tap tap tap, but was sending fuel to the engine.

Now it makes the loud noise tap tap tap (very anoying) and the engine does not start.

I read that if an electric pump makes a lot of noise the pump could be having problems or is bad.

Also - could there be a lot crap inside my tank? that is blocking the fuel outlet in the tank? My current electric fuel pump filter is clean with no visual debris.
__________________
flatouf is offline   Reply With Quote
Old 04-27-2014, 10:30 AM   #6
2 Rivet Member
 
1979 24' Airstream Excella 24
Woodland Hills , California
Join Date: Feb 2013
Posts: 90
Images: 6
Previously checked the inline filter as well, was clean but replaced it anyway.
__________________
flatouf is offline   Reply With Quote
Old 04-27-2014, 10:59 AM   #7
Rivet Master
 
1989 34.5' Airstream 345
Silverton , Colorado
Join Date: Oct 2003
Posts: 2,101
There is also an in-line filter right at the carbureator...small thing...that one is often missed.
__________________
Michael & Tracy
1989 345 Motorhome
CHARTER MEMBERS: FOUR CORNERS UNIT, AND PROUD OF IT!!!
We live for the moment, 'cause when you get there, it's gone...
ScrapIrony-2 is offline   Reply With Quote
Old 04-27-2014, 11:09 AM   #8
Rivet Master
 
1974 Argosy 20
2014 20' Flying Cloud
Kooskia , Idaho
Join Date: Jul 2009
Posts: 4,591
I believe that most GM fuel tanks on the P 30 chassis have "fuel socks" on the intake end inside the tank. I understand they are like a bag filter to keep the stuff out of the pickup end. They can become plugged over time. I don't think that there is any way to clean them other than dropping the tank and removal and replacement. The fact that you blew compressed air back into the tank (if I read your post right) may have cleared that sock temporarily.

The clicking of the fuel pump, especially if it cannot pull any liquid into it (which quiets it down) is normal for some kinds of pumps.

Your 35 year old fuel system may just need some big time cleaning.

Or, I may be entirely out to lunch. I am trying to grasp at straws with you.
__________________
idroba is offline   Reply With Quote
Old 04-27-2014, 11:44 AM   #9
Rivet Master
 
Smartstream's Avatar

 
1982 28' Airstream 280
Port Angeles , Washington
Join Date: Aug 2008
Posts: 1,371
You might try removing the discharge hose from the electric pump and replace with a short hose that you can run into a gas can. Run the pump and watch the flow and sound of the pump. If you have good flow and the pump sounds good look for a problem at the carb or the plumbing to the carb. If the pump is loud with little flow then think about dropping the tank and having it cleaned.
__________________
Cheers, Dan
________________________________________


"Socialist governments traditionally do make a financial mess. They always run out of other people's money. It's quite a characteristic of them."
~ Margaret Thatcher ~
Smartstream is offline   Reply With Quote
Old 04-27-2014, 12:17 PM   #10
Rivet Master
 
J. Morgan's Avatar

 
1972 31' Sovereign
1975 31' Excella 500
Currently Looking...
Benton , Arkansas
Join Date: Mar 2013
Posts: 5,046
Images: 11
Electric fuel pump problem

I think the pump taping might be an old A/C Delco solenoid style pump doing what it does when it is running dry.

Two possible problems, the tank outlet is blocked, OR you have a leak in the fuel line between the tank and the electric pump causing it to suck air.

I had forgotten about these old A/C pumps, these last a long, long, time, they are pretty quiet when they are pumping but annoyingly loud when running dry.

With the clatter you mention, the problem is going to be with the stuff between the tank and the pump, (including the tank and the pump).

If the problem were forward of the pump, the pump would quietly run and stop once pressure had built behind the obstruction.

My hunch is that you are sucking air from a rubber part of the line above the level of the tank. Just a hunch though.
__________________
The fact that I am opinionated does not presuppose that I am wrong......

J. Morgan is offline   Reply With Quote
Old 04-27-2014, 12:23 PM   #11
Rivet Master
 
J. Morgan's Avatar

 
1972 31' Sovereign
1975 31' Excella 500
Currently Looking...
Benton , Arkansas
Join Date: Mar 2013
Posts: 5,046
Images: 11
I seem to remember a thread about the rubber lines on these motor homes getting pretty rotten after 20, 30, or 40 years.
__________________
The fact that I am opinionated does not presuppose that I am wrong......

J. Morgan is offline   Reply With Quote
Old 04-27-2014, 06:49 PM   #12
2 Rivet Member
 
1979 24' Airstream Excella 24
Woodland Hills , California
Join Date: Feb 2013
Posts: 90
Images: 6
Thank You,

To all of my Airstream Brothers who replied to my fuel pump problem.

I will take Morgans advice and replace the old electric fuel pump and go from there.

The last thing I need is a fuel problem somewhere in the middle of the Desert, so I am fortunate that I have the luxury of fixing this problem at home.

I will let you all know when I find out if it is the hoses, tank, pumps or filter.

Has anybody had a problem with gunk in their tank? and if so what did you do to remedy the problem?

Again, thank you so much...
__________________
flatouf is offline   Reply With Quote
Old 04-28-2014, 09:52 PM   #13
Rivet Master
 
Vycan's Avatar
 
1994 36' Classic 36 Diesel
Manhattan , Kansas
Join Date: Mar 2012
Posts: 803
Blog Entries: 1
What desert are you planning on traversing?
__________________
1994 36' Classic Diesel Pusher
Vycan is offline   Reply With Quote
Old 05-04-2014, 01:36 AM   #14
Rivet Master
 
crazeevw's Avatar

 
1989 34.5' Airstream 345
Saint Petersburg , Florida
Join Date: Apr 2010
Posts: 1,687
Images: 28
I'll see if I can't find the thread, but someone posted a very detailed thread about dropping their fuel tank in the Classic Motorhome. If I make the jump to TBI, it's something that I'll definitely have done at the same time.
Good Luck, Derek
__________________

__________________
crazeevw is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuel Line & Fuel Tank crazeevw Mechanics Corner - Engines, Transmission & More... 4 12-02-2011 08:38 PM
Adding External Fuel Pump smily Mechanics Corner - Engines, Transmission & More... 7 04-07-2004 05:00 PM
Onan Fuel Pump swebster Mechanics Corner - Engines, Transmission & More... 20 11-06-2003 05:35 PM
Electric fuel pump and fuel line routing cooperhawk Mechanics Corner - Engines, Transmission & More... 7 02-06-2003 11:16 AM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 09:39 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.