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Username Post: 86 fuel delivery problem        (Topic#361498)
Codym 
Newbie
Posts: 6

Reg: 06-23-20
06-23-20 07:44 PM - Post#2797059    

I’ve got a 86 Chevy c10. I just replaced the whole fuel system in the truck. Got everything put in and I’m having problems getting fuel to the carb. I’ve got an in-line fuel filter between the pump and carb. Once I start the truck, the fuel filter gets about 2 or 3 good pumps of fuel into and then no more. I’ve replaced the pump again and still same thing. I did try the ol trick with the full fuel can and empty one and it worked beautifully! But once I put everything back to normal, I still get 2 or 3 pumps and that’s it. Any ideas? Possible vacuum leak somewhere? I’m lost and can’t find the problem! Thanks in advance



 




gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25177
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
06-24-20 12:26 PM - Post#2797101    
    In response to Codym

Welcome to the site.
Please provide a few more details. What is the engine size? Is the fuel pump mechanical? Is the fuel filter metal enclosed? If so, it may only flow in one direction. What is the carb type? Are you using a dual fuel tank system? What kind of fuel line is installed between the pump and carb? My first guess is the fuel filter is installed backwards.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
Codym 
Newbie
Posts: 6

Reg: 06-23-20
06-24-20 03:15 PM - Post#2797116    
    In response to gchemist

It’s got a 305 in it and a rebuilt 4bbl Holley carb. it does have a mechanical fuel pump and It does have a inline filter that’s clear and it’s in the right direction. I’ve checked it a million times just like everything else lol. I ended up going with a rubber fuel line from the pump to the carb for now. I had originally bought a new metal fuel line for it but i didn’t buy the correct one and I knew I was gonna change the carberator




 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25177
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
06-25-20 06:30 AM - Post#2797145    
    In response to Codym

Okay, is the carb new? Or did the carb previously work? Who rebuilt it? Is it an ordered rebuilt carb? A company rebuilt carb is normally tested before being sent out. Are the carb bowls filling? What is the carb model and part number?

On my truck, due to extensive modifications, I bent and routed my own fuel line. I have a metal encased in line fuel filter.

Your post will be moved to the Performance Section. Holley carb users will help you if the carb needs adjustments or changes.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
IgnitionMan 
Valued Contributor
Posts: 3759

Reg: 04-15-05
06-25-20 07:47 AM - Post#2797150    
    In response to Codym

Clear filter, please post if the element inside it is a paper, or sintered bronze element.

If sintered bronze, they are directional, in that flow goes through the media ONE direction, stops the other way. We usually see these elements in the inlets to carbs.

Sintered elements also have a spring on one end, to allow for the fuel pressure to push a plugged, or installed backwards element off its inlet side seat, to continue to supply liquid past a plugged, or backwards installed element.

Just more info on a filter.



 
Codym 
Newbie
Posts: 6

Reg: 06-23-20
06-25-20 09:21 AM - Post#2797157    
    In response to IgnitionMan

Ok, I might of gotten y’all confused but that’s my fault sorry. The carb and fuel pump are fine. I hooked up a fuel line going into the pump Coming from a full gas can and then the return line going into an empty can and everything worked like they should. I had plenty of fuel getting to the filter and carb at that time. But when I hooked everything back up original there’s not much fuel going from the pump to the carb. So I’m guessing there’s something wrong somewhere from the tank to the pump. I’ve double, triple checked everything So far except the fuel tank cause it’s in a tight spot. Gonna pull the tank out in the next day or 2



 
TAT_2 
Member #26 "19th Year" Silver Supporting Member, and Official CT Grim Reaper
Posts: 36526
TAT_2
Age: 66
Loc: "UNDER THE BOARDWALK"
Reg: 10-29-00
06-25-20 02:18 PM - Post#2797182    
    In response to Codym

RAN INTO A FEW OLD RUBBER FUEL LINES BEING CRACKED & SUCKING AIR FROM THE TANK FEED.ALSO I NEEDED A PRE BENT RUBBER FUEL LINE FROM THE HARD LINE TO THE FUEL PUMP. JUST USEING REG HOSE THE BEND WAS TIGHT & HAMPERED THE FUEL SUPPLY TO THE CARB .

09 PONTIAC- VIBE
08 PONTIAC- G6
93 VETTE - 40TH ANIV RUBY RED LT1/6SPD/RAG TOP
NEXT ?


*****
PREVIOUS VETTE'S 58,68,70,76,78,85,90
*****


Blessed are the cross-eyed, for they will see God twice


 
Codym 
Newbie
Posts: 6

Reg: 06-23-20
06-25-20 02:26 PM - Post#2797184    
    In response to TAT_2

That’s the thing, I’ve replaced all fuel lines in the truck and I’ve made sure there was nothing that was bent to much were it would restrict flow. The only thing that I can think of that might be the problem is the filler neck, the vent line next to it, or the fuel sending unit. I did replace the sending unit when I pulled the tank awhile back. And I cleaned the tank like crazy so there would be nothing that effect it. So I’m puzzled on why it get a few good pumps of fuel then it stops. But I think I’m gonna pull the tank this weekend cause that’s the only thing that I haven’t been able to double or triple check so far



 
TAT_2 
Member #26 "19th Year" Silver Supporting Member, and Official CT Grim Reaper
Posts: 36526
TAT_2
Age: 66
Loc: "UNDER THE BOARDWALK"
Reg: 10-29-00
06-25-20 02:43 PM - Post#2797186    
    In response to Codym

MIGHT BE A LONG SHOT BUT TRY RUNNING IT WITH THE GAS CAP REMOVED.

09 PONTIAC- VIBE
08 PONTIAC- G6
93 VETTE - 40TH ANIV RUBY RED LT1/6SPD/RAG TOP
NEXT ?


*****
PREVIOUS VETTE'S 58,68,70,76,78,85,90
*****


Blessed are the cross-eyed, for they will see God twice


 
Codym 
Newbie
Posts: 6

Reg: 06-23-20
06-25-20 02:45 PM - Post#2797187    
    In response to TAT_2

Ok I’ll try that before I remove the tank. Thanks



 
wagonman100 
Super Senior Member
Posts: 14534
wagonman100
Loc: Baltimore, MD
Reg: 11-27-04
06-25-20 02:58 PM - Post#2797188    
    In response to Codym

Try the gas cap first, but it sounds like something is getting sucked into the pickup on the sending unit and stopping fuel flow from it.

Jay
Friends don’t let friends drive Fords.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon
1957 Cameo Carrier


 
Codym 
Newbie
Posts: 6

Reg: 06-23-20
06-25-20 03:01 PM - Post#2797189    
    In response to wagonman100

Ok I’ll try it. Thanks for the responses! I’ll let y’all know what happens and what I find out



 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25177
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
06-26-20 06:12 AM - Post#2797228    
    In response to Codym

Codym,
My next suggestion has been given. Remove the gas cap. Are they new or old gas caps? Our C10 trucks are known to stop fuel delivery with incorrect gas caps. Ok, sorry, I read all your initial information incorrectly. The Performance Section is probably our most helpful area. Everyone from newbies to seasoned mechanics are here.

Are you using a 3 port or 6 port switch valve? Can you hear the valve change positions when activated in the cab? Sometimes, the valve can get stuck. It has happened on my dual tank truck.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
bobb 
Super Senior Member
Posts: 5627

Loc: paradise
Reg: 09-05-03
06-26-20 08:24 AM - Post#2797234    
    In response to Codym

i dont understand 2-3 pumps? if you have a glass filter throw it away. fram makes plastic see throughs if you need to see your fuel. mechanical pump? try block off the return line.

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


 




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