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Yank Tank Molotov/3+3, 454/magnum/Allison

'84 K30 Silverado "big Dooley"
Overview Gallery Discussion
With old fuel, I’d be surprised if it wasn’t fuel or clog related

if you can’t do your fuel test, the leakdown is the way, once your shop is sorted of course
 
Bent77 said:
With old fuel, I’d be surprised if it wasn’t fuel or clog related

if you can’t do your fuel test, the leakdown is the way, once your shop is sorted of course
Click to expand...
It did pop like this last year but I chocked it up to the tune. I'm sure the old fuel is contributing to the issue as well
 
I think you're right but I still question the flow of my system. It does crank a while before starting sometimes
 
i did some digging when i did my edelbrock efi swap and they required 10 micron filtration . i used a 90's caddy filter with 3/8" line size and clip on ends .

but if you look the filter up for say my 01 3500-HD truck with 8.1 it calls for this filter and shows 4 micron size filtration . https://www.wixfilters.com/Lookup/PartDetails.aspx?Part=160330 info on left scroll down to see micron specs .
 
I'm using a stock TBI filter on mine. Zero issues.

The lean under load *could be fuel starvation due to an overly restricted filter. But it could be a weak pump or regulator too. I'd get a fuel pressure gauge on it and see what's going on. Ideally a gauge with a long enough hose to pull it back to the windshield and watch as you drive. You want to see what it's doing under a load. Snapping the throttle in park with no load is not going to simulate the load going down the road.

With a baseline reading you can start eliminating the variables. Fuel filter, regulator or pump.

AutoZone has a fuel pressure test kit in their loaner tool program. Looks like it's got a long enough hose to reach to see it while driving.

Might be worth it to borrow the tool on a weekend you got free.
 
ZooMad75 said:
I'm using a stock TBI filter on mine. Zero issues.

The lean under load *could be fuel starvation due to an overly restricted filter. But it could be a weak pump or regulator too. I'd get a fuel pressure gauge on it and see what's going on. Ideally a gauge with a long enough hose to pull it back to the windshield and watch as you drive. You want to see what it's doing under a load. Snapping the throttle in park with no load is not going to simulate the load going down the road.

With a baseline reading you can start eliminating the variables. Fuel filter, regulator or pump.

AutoZone has a fuel pressure test kit in their loaner tool program. Looks like it's got a long enough hose to reach to see it while driving.

Might be worth it to borrow the tool on a weekend you got free.
Click to expand...
That's a good idea I'll see about renting a guage. I do have a new regulator but I hesitate to change it as my current reg is adjustable. The ep381 pump is supposed to be sufficient but I don't know if the tube adapter - 6an fittings are causing any issues or maybe just this China filter. I'll see if I can get some time to try this weekend
 
Haven't had the time to put the new fuel psi regulator in and test/adjust but I did take it for a short cruise.
Before I left I looked through the selections on the dakota dash and there's no signal for trans temp. This worked before.
Now I'm concerned that the new tcm being an 03 and the tcm is still a 01...
I don't know if this is the issue but I do know these things are almost year specific sometimes. Maybe I need to look for an 03 tcm.

IMG_20211215_094653_153.jpg
 
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