The Stovebolt Page Forums Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Helping out ...


EVENTS

Check in for status!

Jump over to the Events Forum, to post events -- new ones or the ones we have been enjoying for some time.
Look to see what's been cancelled or postponed.

Encourage one another!

Stovebolt Site Search
 
Old Truck Calendars
Months of truck photos!
Nothing like an old truck calendar

Stovebolt Calendars

Check for details!


Who's Online Now
15 members (AlanV, 1953 panel, dougs, 59 fleet, 3 invisible), 244 guests, and 3 robots.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums50
Topics121,443
Posts973,643
Members43,932
Most Online1,229
Jan 21st, 2020
Image Posting Policy
Previous Thread
Next Thread
Print Thread
Page 1 of 2 1 2
Fuel pump output
#1377286 Wed Sep 16 2020 02:29 PM
Joined: Apr 2005
Posts: 9,108
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
Generic question. Mechanical fuel pump rotating at a normal 6 volt cranking speed. How much should it pump in a 10 second cranking session? The one I’m checking pumps about 1/4 cup in rather erratic spurts. 🛠


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2)
‘39 Dodge Businessmans Coupe
USAF 1965-69 Weather Observation Tech (got paid to look at the clouds)


"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!

Re: Fuel pump output
Justhorsenround #1377290 Wed Sep 16 2020 02:59 PM
Joined: Feb 2004
Posts: 21,245
H
Boltergeist
Cranking speed is not a good way to check a fuel pump. At curb idle with a warmed-up engine, a disconnected fuel line at the carburetor should pump a minimum of a pint in 30 seconds -. Use a piece of rubber fuel line and a catch can held away from the engine compartment to minimize the fire hazard. If the engine won't idle for 30 seconds on the fuel in the float bowl, you've got carburetor problems.

The volume test is one third of a fuel pump check. Now check the pressure and vacuum of the pump. Since I've been recommending this for 20-something years and I can't ever recall anybody doing the full test, I might as well go look for a chicken with lips!
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Fuel pump output
Justhorsenround #1377295 Wed Sep 16 2020 03:17 PM
Joined: Apr 2005
Posts: 9,108
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
Jerry, I agree that the other 2 tests are needed and I have the equipment to do them. Just posed the question, during a break, to see if it was necessary to continue on with the testing or if 1/4 cup in 10 seconds was good enough. FWIW the engine starts then immediately dies so I can’t do a curb idle test right now.


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2)
‘39 Dodge Businessmans Coupe
USAF 1965-69 Weather Observation Tech (got paid to look at the clouds)


"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!

Re: Fuel pump output
Justhorsenround #1377299 Wed Sep 16 2020 04:10 PM
Joined: Feb 2004
Posts: 21,245
H
Boltergeist
Rig a gravity feed fuel source and find out why the engine won't keep running. Then do things the right way. Model T's and Model A's ran millions of miles without a fuel pump.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Fuel pump output
Hotrod Lincoln #1377319 Wed Sep 16 2020 06:38 PM
Joined: May 2015
Posts: 2,969
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Originally Posted by Hotrod Lincoln
Model T's and Model A's ran millions of miles without a fuel pump.
Jerry
But sometimes, Model T's had to back up a hill with a low fuel level and the tank mounted under the seat. Model A's, with a cowl mounted tank didn't have that problem.


Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos [flickr.com]
Busting rust since the mid-60's
Re: Fuel pump output
Justhorsenround #1377320 Wed Sep 16 2020 06:46 PM
Joined: Feb 2004
Posts: 21,245
H
Boltergeist
I can't seem to find the fuel pump on my Harley EVO, and it's got nearly 90K miles on it! Gasoline, like a plumber's favorite moneymaker, "flows downhill!"
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Fuel pump output
Hotrod Lincoln #1377323 Wed Sep 16 2020 07:01 PM
Joined: May 2015
Posts: 2,969
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Originally Posted by Hotrod Lincoln
... plumber's favorite moneymaker ....
grin
"It may be $%!* to you, but it's bread and butter to me"


Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos [flickr.com]
Busting rust since the mid-60's
Re: Fuel pump output
Justhorsenround #1377331 Wed Sep 16 2020 07:47 PM
Joined: May 2005
Posts: 7,530
B
General Purpose
1/4 cup in 10 full, timed with a clock, seconds, sounds low. 6V system or 12V system, makes no difference. Your test is good, it is real life condition. Simulating trying to start a motor that may have no gas in the carb bowl. Starts immediately? Then dies. Does it die immediately? Like real fast? That there is electrics. The ignition switch or foot switch or if you had a ballast system, it would be that. After it dies, check the throat of carb for squirt. Run a gravity gas feed into carb inlet without blowing yourself up. Seems odd there would be just enough gas in bowl for one squirt start and nothing left to run a minute. I'm going with electrics until you try some stuff. Check the linkage too.....and choke.
Erratic spurts is one thing.....it will pulse but be a evenly spaced steady pulse, and strong if battery is good. After lines are full, maybe one pulse per second. Try 15 clock seconds and see how much gas you get. The cam shaft is only running at half speed of the crank, so 10 seconds is short. On the other hand 1/4 cup will fill a carb bowl. So OK, I talked myself back to electrics/spark.

BOTTOM LINE: Your truck won't stay running, right? We should start there with normal trouble shooting. Gas/spark/air/compression.
I don't know what motor or ignition system we are talking about. Would be nice to know that. What key switch? solenoid or foot start? Must be 6V???? Must be 39 or 47?????? You have no right to remain silent, nothing you say will be held against you.


Watch out for careful drivers!!!
I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.
You can't teach a new dog old tricks.


Re: Fuel pump output
Justhorsenround #1377338 Wed Sep 16 2020 09:08 PM
Joined: Apr 2005
Posts: 9,108
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
bartamos, the project must for obvious reasons remain undercover. Foot start, good spark (tested), electronic ignition, fresh pro rebuild on Stromberg BXV-3, fresh real gas. Right now I’m leaning toward a mess up by the carb rebuilder but I’m going to complete the fuel system tests before I exercise my 6 month warranty option. All ideas are welcome.


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2)
‘39 Dodge Businessmans Coupe
USAF 1965-69 Weather Observation Tech (got paid to look at the clouds)


"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!

Re: Fuel pump output
Justhorsenround #1377346 Wed Sep 16 2020 09:52 PM
Joined: May 2005
Posts: 7,530
B
General Purpose
6V ? Pertronix? Rigging carb with a gravity feed bottle, no fuel pump, will sure help to eliminate or identify carb. Eliminate or identify any up stream problem. Pump, lines, debris, venting lock..... Rig it up and you will know today.

Any lawn mower or boat tank hung high will do. Temp. Tank must be vented or open top. Did you observe squirt after is dies?


Watch out for careful drivers!!!
I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.
You can't teach a new dog old tricks.


Page 1 of 2 1 2

Moderated by  Woogeroo 

Link Copied to Clipboard
Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Powered by UBB.threads™ PHP Forum Software 7.7.4