My truck is bogging out? need help!!!

[frog210]

Hello everyone I have a question

My truck is dying/bogging out on me
When I get between 20-30
My truck starts to bogg out
idk what it is

When i first got the truck
it didnt do that
Then it started to do it
so i took it to this guy i know to rebuild my carb
(Thats what i thought it was)
Worked Fine for like a week
Now its starting to do that again
i have a 74 chevy 350 with a 4 brl quadjet carb
please i need help

[UPNADM]

Fuel filter is clean?
Base gasket fine?
Is is vacuum or manual secondary? Are vacuum lines good, mechanical linkages free?

[lifted k10]

Is it bogging down to the point that it stalls out, like it's flooded from fuel and trouble restarting unless the gas pedal is held wide open?

[HTX86chevy]

fuel pump

[frog210]

fuel filter looks clean
Base gasket looks fine( they put a new one on when they rebuilt it
vacuum or manual secondary not to sure about that?
When im going to 20-30 it will yank like forward and back
and will lose power
if i keep my foot on it it will die
i have to take my foot off and let it slow to like 10mph
it wont let me go over 30 mph
so i have to use the side streets

[carboncrew]

My 1986 use to do something similar. Thought it was fuel pump....until I replaced the motor I FINALLY realized it was fuel line going into fuel pump....it was old and getting kinked....sounds dumb but it's helped several people having the same problem. Worth a quick look.

[frog210]

okay im going to take a look at that too wont hurt to look right

[motornut]

vacum advance or vac leak
the line from the pump to the carb...mine was full of rusty crud,not caught by the filter
and the new fuel pump sure helped

[frog210]

okay i think im going to replace my

In carb filter(paper one)
my fuel filter the glass one
my fuel hose from the pump to the carb
and my fuel pump
is their anything i should do before i change my pump?
any precautions or tips thanks

[frog210]

okay i think im going to replace my

In carb filter(paper one)
my fuel filter the glass one
my fuel hose from the pump to the carb
and my fuel pump
is their anything i should do before i change my pump?
any precautions or tips thanks

[motornut]

safer to do it on a cool block
line pump to carb should have pressure watch for it
if that line is ok to reuse, just blow it out
I use FI clamps, they don't chew the rubber line up
and make sure it's fuel hose!!!

[mMad Dawg]

Something else you might want to check is your coil and coil wire . When thy start to break down they act like a fuel problem. I've had it happen to me before,drove me crazy till I found the problem . Hope this helps. Gord

[Weasel Diesel]

Other than the fuel system, If you are running a cat converter they can stop up and cause a heap of problems too. I too would start at the fuel system and make sure that's ok first.

[frog210]

Okay
I replaced the following:
fuel pump
both fuel filters
and it runs great
I think it might have been the fuel pump

[HTX86chevy]

Glad to hear good news, good job man.