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Ok First off

79 Luv Weber Carb No PSI REG, OFFY, everything else stock...

So ive been trying to get this thing up and running got all of my stuff back to stock after trying to upgrade dizzy with no success.. I go the thing to run for a while it would idle fine but under load it would back fire and then die... After it died you couldnt get it started again... That was awhile back moved it back into garage now if I hold the key into the start posistion it will not start but he second i let off it starts right up runs like crap for a couple minutes sputters and dies... try and do it again will back fire and start when i let off key.... I added a BS inline PSI guage to see what i was getting from pump... While its "running" it reads 1 PSI and after it dies reads 5-6... so im thinking do I need to add the regulator or is it timing/fuel mixture... I know there was just a post on this smame subject but didnt get really anything out of that thread that would fit whats going on with my rig...

ANY THOUGHTS?

BUMP Im back to tinkering with truck found a better fuel pump and holly regulator anyone else have any Ideas?

have you changed your fuel filter? 1 psi while it's running doesn't seem like enough flow to supply the carb. After it shuts off it can build up enough through a clogged filter to get that much psi but the volume might not be there when it's running. Hard to check timing if you can't get it to run but the backfiring might be a timing issue. Also check your spark plug wires....it's possible if you have done anything with them that you have one crossed.

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In life there is the "Way things should be" and then "There's the way they are".

2005 Silverado 3/4T Crew Cab
1981 Luv 2WD
1979 Luv 4x4 Currently going through Open Heart and Cosmetic surgery
1995 Roughneck JetBoat
1981 Luv parts trk

fuel filter? pull a plug and check to see how hot your spark looks?

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If you ain't livin on the edge, your takin up to much space.

Funny you mentioned the fuel filter i pciked one up on the way home yesterday. Going to throw everything on this weekend. Threw the battery charger on trickle so hopefully be done and ready to go tomorrow. Still cannot find a 0-5 PSI guage looked every where in town gonna do a little online shopping today.

check your pump diaphragm #36 on the weber diagram and your power valve #14 some times when the carb backfires it will blow the rubber in the diaphragms on the webers...
http://www.carburetion.com/diags/3236DGVDiaginfo.asp

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My old but now gone Luv...

When ever I have experienced a car that starts after the key is let go, it has a wiring issue. Get the test light out and go check the positive side of the coil. Key on it should light up the test light. Key to start test light should stay lite. I your case I assuming it will go out. On your coil you have two wires on the positive side. One wire is from the ballast resistor and should have less than 12 volts, @8 volts, and another wire that is only live when the key is on, and this wire has 12 volts to help start the car. This wire could be broken and shorting out and grounding the coil when the key is at start or it might be place on the neg side of the coil, making the coil only work when the key is on an not in start position. Hope this helps.

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makes sense espicailly as many times as I have messed with it.

Thanks

As far as the not starting until the switch is turned from start to run our trucks have a ballast bypass mode. This gives the coil 12V when in the start position that is triggered by the ignition switch. The relay that controls this is in the relay panal on the right rear firewall, there are several relays there, fuel pump, ballast bypass and vacuum switching relay. Sounds like it is dissconnected or removed. There should be 2 wires going to the positive side of the coil, one from the ballast and one from the bypass. Ben has the wiring diagrams on the site, have a look at them and that should answer your question. Its hard for me to explain all of this in a post so grab a soda and read the diagrams.

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Certified pilots, looking down on people since 1903.

X3 on the ignition bypass circuit. As for the 0-5-psi pressure gauge, check vacuum gauges as some of these have a 0-5 psi scale on them.

I printed out both pages of the wiring diagram for my truck and keep them in the glove box. Thanks to a great site. I think sometime this weekend youll be cruisin.

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1980 4x4

OK so replaced fuel pump filter and i got nothing... However i got no spark from coil gonna trouble shoot that now any suggestions where to start?