Finding a fuel blockage?????
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Elder User
Joined: Jul 2004
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From: Westminster, Colorado
Finding a fuel blockage?????
Hi all......just to keep you up to date...my truck is starting fine again..the new starter really did the trick......but now I have the *next* problem to deal with....I seem the have a fuel blockage of interruption of some sort.....this first happened when i was accelerating away from a light...but now it happens even when just cruising down the road...the truck acts like it is out of gas....or only getting half what it needs....at first this was just a juiggle here or there....but today it went into "blocked mode" for a good 6 to 10 seconds....so far it has not out and stalled yet on me...seems to come back with a little feathering of the gas pedal....but it got me on the situation...I have an electric fuel pump that i have located under the cab....all the lines are clear...there is no junk in the gas tank and i have replaced BOTH fuel filters (one before the pump, one after).....is there something else I am not considering????
Oh yeah....I ran the fuel pump into a bucket to check it's operation....it fills a .5 liter bottle in about 18 seconds.
Oh yeah....I ran the fuel pump into a bucket to check it's operation....it fills a .5 liter bottle in about 18 seconds.
Hotshot
Joined: Oct 2002
Posts: 18,488
Likes: 22
From: The Big, Oregon
At night, shine a flashlight down into the tank, and see if anything floating around in there. Also, make sure the rubber line from inside the cab to the frame isn't kinked, and if it's in questionable shape, replace it.
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Elder User
Joined: Jul 2004
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From: Westminster, Colorado
I looked down in there already and it's pretty clean......I have metal lines in the cab....there is a "straw" inside the tank that couples to a steel line going through the floor pan, then my rubber....blew through all these lines and had clean flow...
Senior User
Joined: Sep 2002
Posts: 462
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From: Barrington USA
check the fuel filter its in the left wheel well, if its rust color then u have rust in the tank, if it hasn't been changed in a whille it can get dirty, and can cause the problem ur experincing, thats what happened to mine
Elder User
Joined: Jan 2002
Posts: 525
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From: Mansfield, Texas
I thought I had mentioned this in an earlier post. If your fuel pump is to far from your tank, it will cause a "vapor lock" situation.
Where does it sit now? Reference it's location from the side of the truck.
When I installed my fuel pump after my rebuild, I placed it in the frame just behind the front bumper. (easy access, I thought). Nope.
Anyway, someone here had the similar problem and informed me to place it closer to the tank. I did. Never had the problem occur again since.
Right now my pump sits just under the middle of the rear door. That would be in the middle of "the" door on a single cab.
It shouldn't take you but about 10 mins. to cut and move it.
Good luck.
Robert P.
Where does it sit now? Reference it's location from the side of the truck.
When I installed my fuel pump after my rebuild, I placed it in the frame just behind the front bumper. (easy access, I thought). Nope.
Anyway, someone here had the similar problem and informed me to place it closer to the tank. I did. Never had the problem occur again since.
Right now my pump sits just under the middle of the rear door. That would be in the middle of "the" door on a single cab.
It shouldn't take you but about 10 mins. to cut and move it.
Good luck.
Robert P.
Junior User
Joined: Mar 2005
Posts: 74
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From: prescott valley, arizona
i had a problem just like that w/my '70 when i bought it. on mine, the tank behind the seat had a metal tube that the gas flowed out to the engine. at the bottom of the tube there was a metal screen,(like the one in your kitchen sink faucet), i punched it out w/a coat-hanger and never had the problem again.
Cargo Master
Joined: Apr 2004
Posts: 2,574
Likes: 4
From: Golden, CO
Re-check wiring and connections for the fuel pump. Strange things happen when you're shaking and rolling down the road. They won't show up in the driveway because the truck is pretty much static.
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Elder User
Joined: Jul 2004
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From: Westminster, Colorado
So you are saying there is a screen at the end of that tube in the tank? That sounds like what I'm looking for.....I opened the tank hoping to find a clogged strainer and saw none....but that little screen you describe would explain the strange ness....I'll see if I have one too....
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Junior User
Joined: Mar 2005
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From: prescott valley, arizona
[QUOTE=Unimog005]So you are saying there is a screen at the end of that tube in the tank? ]
yes, because of how many years my truck sat before i bought it, the screen got gummed up like a carb does.
yes, because of how many years my truck sat before i bought it, the screen got gummed up like a carb does.
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Elder User
Joined: Jul 2004
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From: Westminster, Colorado
If there is a screen in mine....I cannot find it...that part is clear and clean anyway....Looks like I might be having a vapor lock issue....the only thing I have not done at this point is to switch the rubber 5/16" fuel line to 3/8" steel.....maybe that will tame the problem.....
Also.....I tried to buy a news thermostat to lower the engine temps a bit...and the one they gave me for a 390 engine (1969) was too small...I need one that is 2.5" across....do I have a special manifold of some sort? What is the proper thermostat??
Also.....I tried to buy a news thermostat to lower the engine temps a bit...and the one they gave me for a 390 engine (1969) was too small...I need one that is 2.5" across....do I have a special manifold of some sort? What is the proper thermostat??
Senior User
Joined: Aug 2001
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From: Wimberley, TX
I had a similar problem with my 71. The pickup tube from the tank had a lot of varnish in it, kinda like cloged arteries. I took my tank to a radiator shop and had it boiled out. What you might try is to work a .30 cal bore brush down thru the pickup line like a chimney sweep.
hth
hth
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Elder User
Joined: Jul 2004
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From: Westminster, Colorado
Well......I checked it out in a much more stupid manner.....I put a length of rubber hose to the fitting on the top of the tank, and then blerw through it to make sure I was getting through easy and to knock anything out that might be blocking it.....It blew smooth as silk......and pressurized the tank!!! So, I removed my rubber hose and had a gyser of gas spraying in the truck! What an idiot......you'd think I'd used enough bongs in my life to realize what would happen!!!! Anyway.....I feel certain that this is heat getting trapped in the fuel line and the rubber is insulating it an keeping the theat in there.....I'm going to try swithing to the steel line and putting the 180 degree stat in to replace the 195 that I have now.....
New User
Joined: May 2005
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I just went through this on Sunday.
Truck acted like it was starving for fuel, sputtered and coughed at anything over just over idle.
Worked on it for about 4 hours, cleaned all the lines, added an electric pump at the tank and cleaned the filters..... Nada?!
Better take a minute and check for something else.
Turned out my MSD coil crapped out!! Only a couple months old.
Swapped to a Bosch 009 form the old VW stash (it was late Sunday eve. nobody open) Runs great again!
If you think you have good flow and pressure..... check for spark.
Good luck!!!
Truck acted like it was starving for fuel, sputtered and coughed at anything over just over idle.
Worked on it for about 4 hours, cleaned all the lines, added an electric pump at the tank and cleaned the filters..... Nada?!
Better take a minute and check for something else.
Turned out my MSD coil crapped out!! Only a couple months old.
Swapped to a Bosch 009 form the old VW stash (it was late Sunday eve. nobody open) Runs great again!
If you think you have good flow and pressure..... check for spark.
Good luck!!!
Thread Starter
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Elder User
Joined: Jul 2004
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From: Westminster, Colorado
Funny you should say that.....when I had some starter porblems a while back I replaced all the ignition stuff, except the coil....they sold ma adefective one and I just got the replacement....I did notice a while back (starter prob) that the spark from the "blue streak" coil was an orangy color.....
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Elder User
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From: Westminster, Colorado
well, tried the coil replacement...but it didn't solve the problem....I finally gave up and took it in to the shop.....where they found that I had a hole of some sort in the fuel pick up tube inside of the gas tank.....picking up air and causing the "Strange acceleration" it appears it was my problem....
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