Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > MOTORHOME FORUMS > MH-General Discussions & Problems
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 07-15-2019, 09:17 PM   #1
Senior Member
 
cimplexsound's Avatar
 
Join Date: Aug 2013
Posts: 893
Running an inline fuel pump


Name:   ImageUploadedByiRV2 - RV Forum1563245625.825418.jpg
Views: 501
Size:  29.5 KB

For those of you that don't know me. I have been on this forum for quite some time. I have a 1990 Ford Fleetwood Flair Class A with about 39,000 miles on it and it's a fairly clean coach for the age, only lightly used. The motor runs most excellent but the fuel pump has given me a little trouble at least 3 times. I'm considering pulling the factory fuel pump from the tank and replacing it with an defiant inline fuel pump so it will be easier to replace if it goes out. The fuel tank is fairly easily to get off once I have all the gas safely removed. This is the big block Ford 460 motor on the F-53 chassis. Any suggestions on what would be an appropriate inline pump. Plus while I am a very experienced mechanic I do not know if the 460 motor needs a high pressure or a low pressure pump. I plan to leave the sending unit and strainer module in place and just reroute the 12 volt wiring to the new inline pump. Just going to use the existing steel fuel line to make the installation easy so it will be done correctly. I think it's a low pressure pump it needs but I am not sure. Please feel free to pile on the suggestions. I could use all the help I can get. Thanks in advance
cimplexsound is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 07-15-2019, 09:23 PM   #2
Senior Member
 
cimplexsound's Avatar
 
Join Date: Aug 2013
Posts: 893

Name:   ImageUploadedByiRV2 - RV Forum1563247375.836512.jpg
Views: 505
Size:  103.9 KB
cimplexsound is offline   Reply With Quote
Old 07-15-2019, 10:39 PM   #3
Senior Member
 
Join Date: May 2017
Location: Metamora, MI
Posts: 5,518
The most common reason for repeat fuel pump failures is dirt in the tank.
Drop the tank, clean and inspect and put a quality pump in.
__________________
2002 Newmar Mountain Aire Limited 4370 w/ Spartan K2 and Cummins 500hp
ASE Master Certified (a long.....time ago...)
Dav L is offline   Reply With Quote
Old 07-16-2019, 06:02 AM   #4
Senior Member
 
Join Date: Nov 2009
Posts: 1,152
You didn't say what the trouble with the pump exactly was. If you have had multiple pumps go bad are you installing aftermarket pumps?
I was a Shop Foreman for the City of Phoenix and from our experience I would not install an aftermarket pump in my motorhome, or any of my vehicles.

If you go with an external pump get one with the highest flow rate. The small pumps sold by most local auto parts stores won't flow enough fuel. Look up the pressure of the oem pump to determine what pressure you need. You also need to determine where the pressure regulator for the pump is to see if you need to add one.

Not sure on you mh but most have a tie in to the oil pressure switch so the pump won't run if the engine stalls. Could this be your problem?
leadman is offline   Reply With Quote
Old 07-16-2019, 06:15 AM   #5
Registered User
 
Ford Super Duty Owner
Join Date: Nov 2014
Location: NW Ohio
Posts: 7,114
Quote:
I do not know if the 460 motor needs a high pressure or a low pressure pump.
If you are carburated, you'll need low pressure. If you're fuel injected, including a throttle body injector, you'll need high pressure.
Waiter21 is offline   Reply With Quote
Old 07-16-2019, 06:55 AM   #6
Senior Member
 
Join Date: Jul 2015
Location: Watertown NY USA
Posts: 6,446
Before I dropped the tank I would install an inline pressure gauge and monitor the fuel pressure under normal driving conditions. The in tank pump will have a strainer attached which may have debris trapped in it which could restrict fuel flow. Check this before condemming the pump.
Ford vehicles are known for fuel pressure regulator problems. Install the pressure gauge down stream of the regulator to get a true pressure reading.
If the pump is bad I would replace it with an in tank pump like was installed originally. The in tank pumps run in fuel which helps to cool the pump. Electric pumps are designed to push fuel not to draw fuel. The closer to the fuel the more efficient the pump will be. I don't like to see a vehicle with an in tank pump run with less than 1/4 tank of fuel. Running the tank down to near empty often will shorten pump life from running too hot.
I don't have the pressure spec. for the F 53 chassis but an F 350 1990 pick up with a 460 delivers 45 GPH at 45 PSI. This pressure will be slightly lower beyond the pressure regulator. Usually about 5 PSI. lower.
Find and check the ground wire connection to the vehicle's frame. Take it apart and clean the connector and the frame to assure you have a good ground connection. Check the ground wire where it enters the connector for corrosion, rust and possibly broken wire strands. Poor grounds will cause the pump to overheat and sometimes shut down or slow down which will drop the fuel pressure.
If you do elect to replace the existing pump with an in line pump you should remove the in tank pump and make up a fuel tube which connects to the fuel pump hanger and install a filter on the bottom of the tube. The in tank pump will restrict the flow if left in the tank and you try to draw fuel through it. Keep the filter just off the bottom of the tank.
Lynn
__________________
2002 Fleetwood Storm 30H on Workhorse P32 chassis 8.1 gas.
LETMGROW is offline   Reply With Quote
Old 07-16-2019, 08:44 AM   #7
Senior Member
 
mhbell's Avatar
 
Thor Owners Club
Forest River Owners Club
Ford Super Duty Owner
Georgie Boy Owners Club
Join Date: Feb 2011
Location: Utah
Posts: 657
vapor lock

I have had 2 F-53 chassis with the 460 engine. Both had the same problem with vapor lock on a hot day even with a new fuel pump. I would let the engine cool down a bit and she would start up and go until it got hot again maybe 25 miles. this was on hot days 90 plus deg F. Maybe a inline fuel filter would have helped with the problem.
Mel
__________________
2016 Thor Axis 24.1
web site https://rvbloggers.wordpress.com/
mhbell is offline   Reply With Quote
Old 07-16-2019, 09:14 AM   #8
Senior Member
 
rlott2k's Avatar
 
Join Date: Aug 2013
Location: BC, Cariboo, Lower Mainland.
Posts: 2,293
Running an inline fuel pump

Our 97 was a 460 EFI , the pump failures were a known issue due to hot vapor returning to the tank and overheating the pump. The fix was a ) keep the tank more than 1/2 full as the fuel will keep the pump cool, or b) replace with an upgraded o.e. Fuel pump and jumper harness. Not sure if it’s still available. I think a 1990 may be carbureted though.
__________________
2022 25FKBS
rlott2k is offline   Reply With Quote
Reply

Tags
fuel, fuel pump



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
Not sure must have missed 2nd inline fuel filter on fuel line to generator Brecklundin Rexhall RV Owner's Forum 2 02-17-2019 08:31 PM
Inline electric fuel pump, 1997 ford F53, 460 howardmcc Class A Motorhome Discussions 5 06-29-2016 07:14 PM
Inline fuel filter quickiwe Freightliner Motorhome Chassis Forum 9 11-08-2013 10:56 AM
A inline fuel pump for a 325 cummins Diesel???? Our Wings Monaco Owner's Forum 3 06-27-2013 10:38 PM
inline fuel pump for 454 chevy holidayram Class A Motorhome Discussions 18 09-23-2011 12:10 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 05:51 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.