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Supporting Member of Barthmobile.com 9/17
Picture of Duane88
posted
Ok. so I had a new exhaust system installed, and added an eclectic fuel pump, existing fuel pump still inline and functioning. Went on a test run it was wonderful, Quiet, great power, could hear all the inside rattles ( another project ). Got back, big ass smile on my face. Shut the ignition off, and all hell broke loose. Engine loping along and backfiring like crazy. Turned the ignition on and off several times and it finally shut off. P30, 454, carbureted.

Where should I start the trouble shooting process? Thanks


25 Ft Glassnose, 2792, 1982
454 Engine
Plain Jane Interior
Original Paint
Fire light Picture by Kevin, GTG 2017 Ohio
 
Posts: 158 | Location: Clinton Iowa | Member Since: 04-02-2017Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 7/17
Picture of Steve VW
posted Hide Post
Run on requires hot engine, plenty of air/fuel mix to keep on running.

#1 thing to try: adjust idle speed as low as possible. Less likely to run on. Also, try shutting off in drive to load it down a bit. (Keep foot on brakes, don't forget to put it in park when done)


8607-3346-33TFPOB------9708-M0037-37MM-01
86 Regal SE 33 Tag axle--"98" Monarch 37
Chev P3(7) 454TBI--------Cummins 8.3 300 hp
400 hp fuel injected-------6 spd Allison, Spartan MM
 
Posts: 3216 | Location: Kalkaska, MI | Member Since: 02-04-2011Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 8/16
Picture of Kevin
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The problem you have is also referred to ad "Dieseling" in a spark combustion or gasoline engine. Your octane rating is to low. Octane rating is the capacity for the fuel NOT to burn under high compression. The higher the octane rating the better the fuel will withstand compression ignition. Old fuel will also have little of no octane.
I suggest trying premium fuel with a higher octane rating. Look also for a fuel without alcohol in it.
 
Posts: 2560 | Location: Northeast , Ohio | Member Since: 07-29-2012Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 2/16
Captain Doom
Picture of Rusty
posted Hide Post
Run-on is rare; it used to be caused by combustion chamber deposits from leaded fuel retaining enough heat to ignite the fuel, so your prob;em is odd.

Changing gaso grade may help, but if the issue persists, shutting the engine of in gear usually cures the problem.


Rusty


MilSpec AMG 6.5L TD 230HP; built-to-order by Peninsular Engines:  Hi-pop injectors, gear-driven camshaft, non-waste-gated, high-output turbo, 18:1 pistons.  Fuel economy increased by 15-20%, power, WOW!"StaRV II"

'94 28' Breakaway: MilSpec AMG 6.5L TD 230HP

Nelson and Chester, not-spoiled Golden Retrievers

Sometimes I think we're alone in the universe, and sometimes I think we're not.
In either case the idea is quite staggering.
- Arthur C. Clarke

It was a woman who drove me to drink, and I've been searching thirty years to find her and thank her - W. C. Fields
 
Posts: 8200 | Location: Brooker, FL, USA | Member Since: 09-08-2005Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 9/17
Picture of Duane88
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I may have caused this problem, I noticed the engine ran a bit smoother at a bit higher idle, so I set it up just a smidge!!!

So I took Steve VWs' advice, reset the idle as low as possible, actually no adjustment screw touching at all.

Took the same trip as yesterday, came back home, still smooth and quiet, no big ass smile though. Backed it in the driveway as before, put it in drive and shut it off, big ass smile returned!!

Thanks you all again!!!


25 Ft Glassnose, 2792, 1982
454 Engine
Plain Jane Interior
Original Paint
Fire light Picture by Kevin, GTG 2017 Ohio
 
Posts: 158 | Location: Clinton Iowa | Member Since: 04-02-2017Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 9/16
Picture of Quinn
posted Hide Post
With an eclectic fuel pump, shouldn't the fuel grade be irrelevant? I'd imagine the pump, being fond of diverse fuels, would be able to temper any of the cylinders' closed-mindedness.


89 28' Regal
Quad Bunks
P-30 454
8906-3623-28C-B
 
Posts: 252 | Location: San Leandro, California | Member Since: 08-06-2014Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 9/17
Picture of Duane88
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Quinn, I hope you are right, in Iowa the state loves ethanol so a lower tax rate and normal regular is like $0.20 higher per gallon.

The P30 Chevy engineers once again need some age and experience. The rear fuel tank, installed by GM is centered in the vehicle right behind the differential, next to each side not more than 4 inches away run the exhaust pipes for about 3 or 4 foot. It is like a heater on each side. I put my hand on the tank after an hour or so run and it was actually kind of warm. I read some of todays gas can boil at around 140F, so any external fuel pump be it electric or manual pulls it to negative pressure...hello Vapor Lock!!

MY electric pump is in the rear so it does not have to evacuate as hard to get fuel as the engine pump did. I hope enough to stop my vapor lock problems. The electric pump also puts positive pressure on other hot spots in the fuel
line.


25 Ft Glassnose, 2792, 1982
454 Engine
Plain Jane Interior
Original Paint
Fire light Picture by Kevin, GTG 2017 Ohio
 
Posts: 158 | Location: Clinton Iowa | Member Since: 04-02-2017Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 9/16
Picture of Quinn
posted Hide Post
I am obviously not as funny as I think I am.


89 28' Regal
Quad Bunks
P-30 454
8906-3623-28C-B
 
Posts: 252 | Location: San Leandro, California | Member Since: 08-06-2014Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 7/17
Picture of Steve VW
posted Hide Post
Don't worry Quinn. ROTFLMAO

It's so hard to get into a fuel pump's head to understand! Wink


8607-3346-33TFPOB------9708-M0037-37MM-01
86 Regal SE 33 Tag axle--"98" Monarch 37
Chev P3(7) 454TBI--------Cummins 8.3 300 hp
400 hp fuel injected-------6 spd Allison, Spartan MM
 
Posts: 3216 | Location: Kalkaska, MI | Member Since: 02-04-2011Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 9/17
Picture of Duane88
posted Hide Post
My electric fuel pump came with a humor detector, but I failed to install it....Oh well its Iowa!!


25 Ft Glassnose, 2792, 1982
454 Engine
Plain Jane Interior
Original Paint
Fire light Picture by Kevin, GTG 2017 Ohio
 
Posts: 158 | Location: Clinton Iowa | Member Since: 04-02-2017Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 12/10
Picture of ccctimtation
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I'm still googling eclectic fuel pumps. and get only synonyms and non-fool related pimps.


I was taught to respect my elders but it is getting harder to find them!
 
Posts: 725 | Location: St. Charles, MO, USA | Member Since: 10-09-2003Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 2/16
Captain Doom
Picture of Rusty
posted Hide Post
Google "eclectic fool pimps" Big Grin


Rusty


MilSpec AMG 6.5L TD 230HP; built-to-order by Peninsular Engines:  Hi-pop injectors, gear-driven camshaft, non-waste-gated, high-output turbo, 18:1 pistons.  Fuel economy increased by 15-20%, power, WOW!"StaRV II"

'94 28' Breakaway: MilSpec AMG 6.5L TD 230HP

Nelson and Chester, not-spoiled Golden Retrievers

Sometimes I think we're alone in the universe, and sometimes I think we're not.
In either case the idea is quite staggering.
- Arthur C. Clarke

It was a woman who drove me to drink, and I've been searching thirty years to find her and thank her - W. C. Fields
 
Posts: 8200 | Location: Brooker, FL, USA | Member Since: 09-08-2005Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 12/10
Picture of ccctimtation
posted Hide Post
Daaannnng! ggooogle gggggggooooooooooottiitt


I was taught to respect my elders but it is getting harder to find them!
 
Posts: 725 | Location: St. Charles, MO, USA | Member Since: 10-09-2003Reply With QuoteReport This Post
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