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Uphill fuel problems
#1
Hey guys, I wanted to pick your brains. My new motor has been running great all summer. Well the other day it acted like it was running out of gas going up hill. Kept wanting to shut down. Never actually shut off but started missing like running out of fuel. I was just under 1/4 tank. Seemed to go away on flat ground but going up hill on a load it did it a couple times but only on long hills. Only did it couple times. Then I filled up the car and it took 13 gallon so I still had 7 gallon left in the tank. Drove couple days all good. Then yesterday took kids to get icecream and it started same thing again on long hills. And I was just around 1/4 tank or a touch below. So is there any rubber material on the sending unit that could clog the pick up?? Just wondering if it could be that or fuel filter plugging up some and when the carb fuel in bowls goes to back it starts to miss.... possibly pump cant keep up with demand and stress of sucking through clogged filter???
Fuel filter is about 1 year old , carb and motor 1 year old. Tank is about 4 years old maybe 5?? All new fuel lines from tank to pump same time as tank. Wonder if the rubber line at tank to steel line or steel line to pump is breaking down after 4 or 5 years and plugging filter???
I will probably start with the cheap easy stuff like the 2 rubber lines and filter and go from there.
Any other thoughts fellas??
Carb is quick fuel 900 cfm, braided stainless line, mechanical pump, 408 ci Cleveland stroker afd aluminum heads.
Let me know what you guys think. Has ran great up till last couple days!!
Thanks!

Kevin

1971 Mach 1
408C Stroker
C4 w/3,000 stall
8.8" Rear w/3.73's
Disc brakes all way around.

[Image: 28ivsix.png]




                                                                                             
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#2
It certainly sounds like something going on with the sending unit.
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#3
How steep was the hill? Huh

Could it just be the fuel flowing away from the sending unit pick-up on the incline?

Eric

[Image: mach1sig2.gif]
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#4
Mister 4x4;194638 Wrote:How steep was the hill? Huh

Could it just be the fuel flowing away from the sending unit pick-up on the incline?

I was thinking that too but I still had almost 7 gallon of fuel in tank. Hills weren't really steep but long.

Kevin

1971 Mach 1
408C Stroker
C4 w/3,000 stall
8.8" Rear w/3.73's
Disc brakes all way around.

[Image: 28ivsix.png]




                                                                                             
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#5
fuel filter not letting in enough , fuel under a load
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#6
Had a similar issue in a 65 impala. Dirty partially blocked screen on the pick up was sucking closed under load. May be worth looking at.

He has all the vices I admire and none of the virtues I despise
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#7
Oh and I had another car with a mild sbc that sucked the rubber section of the stock fuel line flat. again under load near wide open going up hill.

He has all the vices I admire and none of the virtues I despise
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#8
Luke;194683 Wrote:Oh and I had another car with a mild sbc that sucked the rubber section of the stock fuel line flat. again under load near wide open going up hill.

Thanks Luke. I will try the easy stuff first. Hope I don't have to pull the sending unit, they are a pain in the ass to get to seal properly. All that stuff is less than 5 years old, but I guess gas with ethanol can eat those rubber lines up in a hurry.

Kevin

1971 Mach 1
408C Stroker
C4 w/3,000 stall
8.8" Rear w/3.73's
Disc brakes all way around.

[Image: 28ivsix.png]




                                                                                             
  Reply
#9
Yep if the sender unit was in the top of the tank that would be easy.good plan i always start with the basic easy stuff mostly because i dont know too much moreRolleyes Sometimes i thing we look for more complex solutions to simple Problems Ethanol can gum up lines if there is moister about bit like with methanol. Good luck hope it not a pain to find

He has all the vices I admire and none of the virtues I despise
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#10
Had you been driving the car for while when this happens? You might be getting some vapor lock. Check the routing of the lines as well.

'Mike'
73 Convertible - 351C/4V CC heads/4bolt/forged flat tops/comp 270/rhodes/mallory unilite/tri-power/hookers/glasspacks/c6/3.50 limited slip/Gear Vendors/Global West sub frames, strut rods and shelby style traction bars/ Rear sway bar/tilt steering (not original)

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