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Old 07-11-2007, 07:20 PM   #1
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Fuel supply issue

1978- 24 Argosy, 454- carb. Two fuel tanks.
While climbing the Altamont Pass- No.Cal. it appeared as if someone had just turned the key off.First suspect of course would be fuel filter. These normally show up when power is applied for a lenght of time.
Trouble shooting.
1- disconnect fuel line from filter located in RH side front wheel well. Put this line that was to inlet of fuel pump in mason jar of fuel. Sucked it up- fuel pump O.K.

2.Discard fuel filter.

3.Crawl under Moho to locate tank switching solenoid.By removing lines going into solenoid and blowing (you don't even want to know) into said lines to determine where they went. Supply line to curb tank identified by listening to gurgling in tank as pressure (blowing) was applied.

4.Identify line to fuel filter from solenoid. pretty easy as there are only 2 solenoids and 6 lines to sort out.

5.Splice fuel supply line from tank into line leading to fuel filter.

6. Fill filter bowl with fuel.Install bowl.

7.Prime carb from dixie cup. yea I know about volitility.I'm that kind of guy.

8. Reinstall Air filter and drop access cover in place.

9.Resume happy travel plans.

10. Redesign fuel delivery system with manual by pass valves.

Provided as a forum community service alert. Enjoy travelling not fixin em on the side of the busy freeway.

DG
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Old 07-11-2007, 07:41 PM   #2
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doorgunner , that might not be a good test . I had a similar problem with a later model (94) 454 and did the same thing . It turned out to be the fuel pump , not enough pressure . Truck would idle but as soon as it was put in gear it would stall . Look up the specs and do a fuel pressure test . This may not be the problem but it's worth a check.
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Old 07-11-2007, 07:44 PM   #3
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Guess what- We were able to continue driving! Thanks will check pressure when available.We thought about the pump pressure, but you know when you're off the side of the road you do whats gotta be done ant this worked for us. The solenoid went into a condition of not letting any fuel from either tank thru. Thats why the by pass. We nailed it.
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Old 07-11-2007, 07:48 PM   #4
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reads like vapor lock...

i had this happen a time or few during 2 decades with a moho...

this does resolve after/while doing almost any roadside tweaks....

there are 'cures' but it's still an incline/altitude/heat/line length/whimpy pump related event...

let's hope urs is cured.

cheers
2air'
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Old 07-11-2007, 07:52 PM   #5
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my experience with vapor lock is usually between the fuel pump and the carb. but anything is possible.
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Old 07-11-2007, 07:54 PM   #6
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agreed, i was just commenting based on the symptoms....

Quote:
Originally Posted by doorgunner
While climbing the Altamont Pass- No.Cal. it appeared as if someone had just turned the key off... DG
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Old 07-11-2007, 07:55 PM   #7
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Quote:
Originally Posted by doorgunner
Guess what- We were able to continue driving! Thanks will check pressure when available.We thought about the pump pressure, but you know when you're off the side of the road you do whats gotta be done ant this worked for us. The solenoid went into a condition of not letting any fuel from either tank thru. Thats why the by pass. We nailed it.
Good for you , it still pays to be a shade tree mechanic . Happy trails .
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Old 07-11-2007, 08:17 PM   #8
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Thanks for the post. Got you back on the road, that's what counts.
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Old 07-11-2007, 10:10 PM   #9
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Quote:
Originally Posted by doorgunner
3.Crawl under Moho to locate tank switching solenoid.By removing lines going into solenoid and blowing (you don't even want to know) into said lines to determine where they went. Supply line to curb tank identified by listening to gurgling in tank as pressure (blowing) was applied.
DG
DG,

I'm curious about the dual fuel tanks. Are they original or aftermarket?

Thanks,

Brad
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Old 07-12-2007, 09:51 AM   #10
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Brad; The driver side tank was installed by- who knows . I'm thinking it was some other PO as the service manual only lists an optional 50 gallon unit.The placement of the switch on the dash -(to switch tanks and gauge reading) indicates a non factory install. At the present time I have no idea as to the capacity of either tank.
I started this thread to make folks aware that it's not always the fuel pump or filter that causes lack of fuel.
I could take some pics if you like, may take a few days to get to tho.
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Old 07-12-2007, 11:23 AM   #11
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Check the vent line for a dirt dauber nest.
Does the fuel tank cap make a sucking sound when you open it?

My SOB RV had a similar symptom and after setting still for a while, an audible "Boing" could be heard. It was the tank popping back out after being sucked inward!
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Old 07-21-2007, 07:58 AM   #12
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Gunner, good diagnostic testing....but YUK!! Don't you know that stuff is carcenogenic???

Folks, don't forget that you have a good source of air via your air compressor. I'm fortunate enough to have a quick connect in the compressor compartment should I need to hook up any air driven device ..... like a blower nozzle...

Don't get gas anywhere near your own intake system. That stuff tastes awful too.
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Old 07-21-2007, 08:35 AM   #13
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Thanks for the posting Doorgunner.

Crisp and to the point on what you determined the problem was and your resolution to it. These are the posts we can refer to quickly when having similar problems, as the additional feedback from the "crew" provides other possibilities for what the problem could be in other situations. It's very rewarding to be able to identify and fix a problem and be back on the road in a relatively short period of time.

Barry
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Old 07-21-2007, 11:34 AM   #14
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Rivet Vapor Lock

Quote:
Originally Posted by doorgunner
my experience with vapor lock is usually between the fuel pump and the carb. but anything is possible.
Vapor lock never occurs on the pressure side of the fuel pump. If it did, the pump would simply replace it with more fuel. It occurs on the suction side where the lower pressure lowers the evaporation point. The fuel turns to vapor and the pump stops pumping once it is filled with vapor. Thatís why hotrodders have installed electric fuel pumps at the back at the fuel tank so it can push the fuel to the front.

The manual valves should give you peace of mind now. Thatís what we used on a truck I drove. There was no question about what was happening. Best of luck!

Vaughan
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