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Old 02-04-2013, 03:52 PM
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fuel starving >>> hard acceleration before cruise ?

the carb would run dry during harder throttle then cruise correct ???

i took my suburban on the highway the other day for the first time, with the big tires and such, the truck cruises at 55 mph at just a bit under 2500 rpm. i noticed the first time when i got onto the 1 mile stretch of highway, the afr was jumping from 15.5 to 18 and then off the charts. i wasnt too happy to see this so i backed off the gas a bit and it returned to 14.7-15.5, i did however, stom on it a bit when i first turned onto the nighway.


on the way back from the water, i got back on the highway, and didnt hit the gas as hard the truck never got lean, and stayed at -14.5 all the way home.

im curious if the initial timing is a bit much, or if the carb is just a little too lean on the power mode., maybe the electric fuel pump i have isnt enough for the 454 =[

if i recall, the initial timing was 14 before when i last checked, towing the boat on a long stretch of flat-hill-flat-hill ground at 35 mph, if i hit the gas a bit hard the afr jumped off the chart and u hear the dreaded sound of bogging/detonating which made me thankful that i was over the last hill.

i want to make sure i get this straightened out before we bring the boat back home, its all up hill

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Old 02-04-2013, 07:31 PM
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try making a run at moderate acceleration and watch to see if the a/f is correct then leans out?
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Old 02-04-2013, 09:43 PM
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okay

i just got back from going another highway and drove the truck like i normally would... did the same thing as stated above, got to 50 mph and started starving for fuel, motor bogging, nobueno in a botte however, this is driving in a slight incline.

when i drove home, it was going down hill, and it stayed in the 14.4-14.7 range the entire trip... so could this mean my floats are being pissy???
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Old 02-04-2013, 10:04 PM
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or fuel pump might be having trouble keeping up? try a low speed drive with a load
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Old 02-04-2013, 10:28 PM
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that would probably fall under the situation of towing the boat at 35 mph and it doing the same thing. i guess i could drive with the breaks applied and see if it starves... i hope its not the pump, but i hope its nothing else
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Old 02-04-2013, 10:33 PM
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keep testing until you have the part isolated..you could unhooh the fuel line and do a visual volume check,put a guage on the line if you have one.change the filter by the tank.
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Old 02-05-2013, 09:01 AM
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filter by the tank?

theres a filter by the tank ? mine has the fram big ol replaceable one in the chrome canister, and i have it sitting on the wheel well up front


is there one inside the tank that i dont know about ? and i guess nows a good time to pull the pickup cluster out of the tank and see it anything is fishy
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Old 02-05-2013, 09:09 AM
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not all cars have a fuel filter by the tank,most do.Post exact car or look up in your service manual?
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Old 02-05-2013, 09:12 AM
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its a 1980 suburban chassis 4x4 with the biggest tank ( i think. ) and its got a 1985 454 upfront

ill check lmc or the web to see if i have a filter, dont have a manual atm
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Old 02-05-2013, 10:50 AM
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you should have a filter near the gas tank on the frame rail somewhere.
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Old 02-05-2013, 10:59 AM
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Quote:
Originally Posted by killeratrod View Post
you should have a filter near the gas tank on the frame rail somewhere.
no filter on frame rail till fuel injetion came out eary gm had the filter in the carb . remember the pleated paper or stone filters?
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Old 02-05-2013, 12:42 PM
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im getting ready to go pull the cap off the tank. see if maybe the pickup is clogged. maybe ill do a volume fuel test and see how much gas the tuck can drink
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