Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
Sign in using an external account
Register Forgot Password?


1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Welcome to Ford-Trucks Forums!
Welcome to Ford-Trucks.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Ford-Trucks Forums community today!





 
Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 11-16-2003, 10:55 PM
tdbudman tdbudman is offline
Freshman User
 
Join Date: Jul 2003
Location: S.D. CA.
Posts: 46
tdbudman is starting off with a positive reputation.
86 E350 460 Fuel return valve

O.K. guys, here's one for ya,

86 E350 minnie winnie with a 460, Holley 4180 carb, in tank electric fuel pump. For ever and a day my mom had problems with fuel starvation in this. No one could figure it out. Long story short... I found myself on a trip in the middle of the desert..coughing bla bla bla finally died. I narrowed it down to this fuel return valve (3 way fiitting in the fuel line right before the carb fuel filter). I bypassed it with some spare fuel line I had and plugged off the return line... ran great, got home Ok. What the hell is the purpose other than returning fuel to the tank when the bowls are full? And why do I need that when the float valves shut off the flow anyway? What the hell do I need this $50.00 part for other than to have it stick in the return position and get stranded somewhere ? This part has emmissions written all over it to me. I don't have to smog where I live. I have not checked fuel pump pressure yet although it never starved going up one of the steepest grades in the country (while towing a 2600 lb. trailer) after I bypassed it. Just bought it last week and don't yet have a manual. Can't wait to hear your input. You guys are the source of all Ford knowledge.
__________________
04 F150 Supercrew FX4 with all the good stuff.
71 F250 Camper Special, 390cid, 10:1, cam, Cobra jet hds, Edlebrock perf. intake, headman hdrs, dynomax super turbo dual exhaust.
Reply With Quote
  #2  
Old 11-16-2003, 11:08 PM
82F100SWB's Avatar
82F100SWB 82F100SWB is offline
Postmaster
 
Join Date: Jan 2000
Location: Sioux Lookout, ON, Canada
Posts: 4,687
82F100SWB has a good reputation on FTE.82F100SWB has a good reputation on FTE.82F100SWB has a good reputation on FTE.
It's there to keep the electric fuel pump from over pressurizing the carb, and forcing the needle open.....
It is not for emissions purposes. with the return plugged off, you will notice a decrease in mileage, and if you unhook the vacuum canister lines, odds are that you will see gas forced out of the fittings on the carb... Don't ask how I know.
__________________
96 F350 Crew Psd/5 speed,/4x4... $600 special
96 F250 XLT PSD/5 speed/4x4... Freebie!
92 W250 LE, 4x4/CTD/G360/D60/D70U
86 F250 HD 4x4, 6.9/T19/broken D44 TTB junk/10.25.
8? F100 4x4 Mild 460/T19 D60/welded 10.25/44 Boggers,
It's not what you BUY, It's what you BUILD
Reply With Quote
  #3  
Old 11-17-2003, 08:36 AM
tdbudman tdbudman is offline
Freshman User
 
Join Date: Jul 2003
Location: S.D. CA.
Posts: 46
tdbudman is starting off with a positive reputation.
I kinda figured that. I need to pressure check my fuel pump cause while I was checking flow from the carb it really didn't seem like I was getting much pressure/flow. Certainly not as much as the mechanical pump on my F250. I'm not sure what the specs are for that electric pump yet. Another thing, while I had the valve off. if I blew through it, ( low pressure) most of the flow came out the return side. I put an air hose to it and with 120 psi the flow came out the carb side. Seems like as pressure builds in the valve it should close the carb side and open the return side. Right?
__________________
04 F150 Supercrew FX4 with all the good stuff.
71 F250 Camper Special, 390cid, 10:1, cam, Cobra jet hds, Edlebrock perf. intake, headman hdrs, dynomax super turbo dual exhaust.

Last edited by tdbudman; 11-17-2003 at 08:40 AM.
Reply With Quote
  #4  
Old 11-17-2003, 12:39 PM
tdbudman tdbudman is offline
Freshman User
 
Join Date: Jul 2003
Location: S.D. CA.
Posts: 46
tdbudman is starting off with a positive reputation.
According to Ford it's called a "fuel starvation valve".
__________________
04 F150 Supercrew FX4 with all the good stuff.
71 F250 Camper Special, 390cid, 10:1, cam, Cobra jet hds, Edlebrock perf. intake, headman hdrs, dynomax super turbo dual exhaust.
Reply With Quote
  #5  
Old 11-17-2003, 02:05 PM
iskerbibel iskerbibel is offline
New User
 
Join Date: Nov 2003
Location: right hand of the father
Posts: 16
iskerbibel is starting off with a positive reputation.
I cut one of those open on the '84 f-250 that I had... it just had an orface to restrict flow back to the tank- nothing else. I brazed it back together and it's still on the truck.

I had thought that the problem might've been that thing, but it turned out that some rocket scientist had re-wired the fuel pump, and they ran if off the coil wire... so not only was the current running to the pump through the factory resistor wire, but also through the ballast resistor, hence not enough fuel flow.
Reply With Quote
  #6  
Old 11-17-2003, 08:43 PM
beetle beetle is offline
Senior User
 
Join Date: Nov 2000
Location: sunny san diego
Posts: 285
beetle is starting off with a positive reputation.
The purpose of that valve is to minimize or eliminate vaporlock. It lets a small metered portion of fuel return to the fuel tanks constantly, eliminating or at least reducing the possibility of vaporlock. It does not have any working parts inside, but there is a small screen that could get plugged and cause a problem. They are less than $10 at any parts store. Hope this clears up any confusion.
Reply With Quote
  #7  
Old 11-18-2003, 02:00 AM
tdbudman tdbudman is offline
Freshman User
 
Join Date: Jul 2003
Location: S.D. CA.
Posts: 46
tdbudman is starting off with a positive reputation.
Yeah, I found that out after talking to a few parts guys. I have a great napa guy. If he can't find it, it doesn't exsist. Been following him since 1984. Seems to me like this part causes more problems than it solves. I bought a new one today. Now why is it I can blow through it and nothing comes out the "to the carb side"? Any more grief and I'm gonna put it out of it's misery.
__________________
04 F150 Supercrew FX4 with all the good stuff.
71 F250 Camper Special, 390cid, 10:1, cam, Cobra jet hds, Edlebrock perf. intake, headman hdrs, dynomax super turbo dual exhaust.

Last edited by tdbudman; 11-18-2003 at 02:02 AM.
Reply With Quote
  #8  
Old 11-18-2003, 10:40 PM
iskerbibel iskerbibel is offline
New User
 
Join Date: Nov 2003
Location: right hand of the father
Posts: 16
iskerbibel is starting off with a positive reputation.
The way mine was put together, you should have air coming out both sides- if you plug off the return side, then can you blow air toward the carb? I reckon it means one of two things- either your '86 return valve is made different from my '84, or something is stopped up. I thought it was a filter at first and never could find one at a parts store... surely a dealer can order one.
Reply With Quote
  #9  
Old 11-18-2003, 10:42 PM
iskerbibel iskerbibel is offline
New User
 
Join Date: Nov 2003
Location: right hand of the father
Posts: 16
iskerbibel is starting off with a positive reputation.
hell, I say do what I did- hacksaw the damn thing open at the crimped end! If it's stopped up, then you'll know it was the problem- if not, then braze it back together, put it back on and look elsewhere.
Reply With Quote
  #10  
Old 11-19-2003, 05:17 AM
8 Lugs 8 Lugs is offline
Elder User
 
Join Date: Mar 2002
Location: Easthampton, Ma.
Posts: 506
8 Lugs is starting off with a positive reputation.
The part is called the vapor separator.
The dual line set-up is called "Hot fuel handling"
It is designed to keep a supply of cool fuel available at the carburetor by returning fuel heated by high underbody temps back to the fuel tank, thus eliminating vapor lock as beetle pointed out!
The fuel pump produces 4.3 psi.
The vapor separator also reduces pressure to the carburetor by returning fuel to the tank.
If one plugs the return line this will over pressurize the carb needle/ seat assembly and possibly flood the carb.
Also it will deadhead the pump and prematurely wear it out!
Good luck!
Reply With Quote
  #11  
Old 11-19-2003, 05:41 AM
tdbudman tdbudman is offline
Freshman User
 
Join Date: Jul 2003
Location: S.D. CA.
Posts: 46
tdbudman is starting off with a positive reputation.
8 lugs, u are correct sir. Ding, Ding, Ding! We have a winnah! I found that out today at Pearson Ford, from Daniel in parts. However, he told me that it is available in 3 different sizes. .0040, .0060, and .0090. The different sizes are color coded with a dot at the outlet to the carb. The blue dot is .0040, which is what I have...and doesn't work in my vehicle. The service guys put it in when my mother took it in for the same reason at Drew Ford. (They obviously didn't know exactly what was up either.) I know because I just bought a new one (blue dot, same one that Drew put on there)at El Cajon Ford for $46.00 and made it 1 block down the street before comming to a halt. Daniel couldn't tell me the other color codes however.

I ordered a .0090. (Dad always told me "you can never go too big son, especially with a truck". ) The kicker is according to Daniel, the return orifice is what varies in size, not the orifice to the carb, which actually makes no sense as I am starving for fuel. I also cannot find anyone who knows what size came stock with the vehicle to this point. Now if I put the .0090 on and the return orifice is the only one that is larger, ain't I gonna get even less fuel to the carb? I'm hoping he's incorrect and their both larger. I'll visually check it when I go to pick it up. Oh hell let's just throw some parts at it and see what happens. At least I know what the thing is now. Bye the way, I tested my fuel pump volume this a.m. and I'm getting 1 pint in roughly 16 seconds. It's frustrating when even most of the guys at Ford "don't even know what that damn thing is or does".

Thanks guys. I'll keep you in the loop. I'll know if the .0090 works manana.
__________________
04 F150 Supercrew FX4 with all the good stuff.
71 F250 Camper Special, 390cid, 10:1, cam, Cobra jet hds, Edlebrock perf. intake, headman hdrs, dynomax super turbo dual exhaust.

Last edited by tdbudman; 11-19-2003 at 06:08 AM.
Reply With Quote
  #12  
Old 11-19-2003, 07:29 AM
tdbudman tdbudman is offline
Freshman User
 
Join Date: Jul 2003
Location: S.D. CA.
Posts: 46
tdbudman is starting off with a positive reputation.
One last thing. I assume I should do a fuel pump pressure check as well? The Chiltons just calls for a volume test only with a single in tank pump.
__________________
04 F150 Supercrew FX4 with all the good stuff.
71 F250 Camper Special, 390cid, 10:1, cam, Cobra jet hds, Edlebrock perf. intake, headman hdrs, dynomax super turbo dual exhaust.
Reply With Quote
  #13  
Old 02-16-2004, 02:22 PM
cwbydean cwbydean is offline
New User
 
Join Date: Jan 2004
Posts: 15
cwbydean is starting off with a positive reputation.
I have had the same problem with this damn thing. Only mine started leaking, and in a fix I replaced it with a fuel pressure regulator. I do not have return line and have been wooried about frying my fuel pumps. I have been running this way for about three years now and for well over 30000 to 40000 miles. I have not have had any problems but it has been bugging the back of my mind. If anyone out there has good reasons why it might be detrimental for me to run this way please share
Reply With Quote
  #14  
Old 02-18-2004, 06:12 AM
tdbudman tdbudman is offline
Freshman User
 
Join Date: Jul 2003
Location: S.D. CA.
Posts: 46
tdbudman is starting off with a positive reputation.
My problem turned out to be the in tank fuel pump. It was an intermittent situation. I unplugged the fuel pump wire from the starter relay and hooked it directly to the battery. The pump started pumping fine for a few minutes and then low and behold it started moaning and groaning and the flow decreased significantly. Replaced the fuel pump, (pain in the ***) and it runs fine. My suggestion is to replace your fuel pump because it's just going to get gradually worse. Also, clean out your fuel tank while your at it. Go back to the .0040" vapor separator valve as well.
__________________
04 F150 Supercrew FX4 with all the good stuff.
71 F250 Camper Special, 390cid, 10:1, cam, Cobra jet hds, Edlebrock perf. intake, headman hdrs, dynomax super turbo dual exhaust.
Reply With Quote
  #15  
Old 02-19-2004, 11:44 PM
glennkunsman glennkunsman is offline
New User
 
Join Date: Feb 2004
Posts: 3
glennkunsman is starting off with a positive reputation.
does anyone have the part # for the fuel pressure regulator / return line or source to purchase one?
Reply With Quote
Old 02-19-2004, 11:44 PM
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
1987 F250 460cid fuel problem KRinAZ 1987 - 1996 F150 & Larger F-Series Trucks 11 05-19-2014 12:58 PM
68 F250 Carb will not suck fuel? Killroy 1967 - 1972 F-100 & Larger F-Series Trucks 10 07-19-2010 07:04 PM
Hot fuel return valve kawcrasher Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460) 0 04-14-2006 11:41 AM
Whats the name of it? Piffery1 Fuel Injection, Carburetion & Fuel System 1 06-07-2005 04:14 AM
Ford Spreadbore, 460, help! Skagit Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460) 2 02-15-2004 07:27 PM


Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks

Tags
350, 460, 86, dual, e350, f150, f350, filter, ford, fuel, line, plugged, return, ruturn, valve

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump



All times are GMT -5. The time now is 06:55 AM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup