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Fuel Pump Problem 235 engine
#1383236 Tue Nov 03 2020 12:06 AM
Joined: Feb 2000
Posts: 44
R
Wrench Fetcher
My original style fuel pump is not pumping fuel to the carburetor. The glass bowl fills, but no fuel comes out the outlet side of the pump. The pump was rebuilt, and tested out OK. Any thoughts?

Re: Fuel Pump Problem 235 engine
Rusty 54 #1383239 Tue Nov 03 2020 12:16 AM
Joined: Mar 2014
Posts: 1,771
J
Shop Shark
Did the pump work ok after it was rebuilt? That is to ask did it just begin doing this or did it begin after the pump was rebuilt? Have you disconnected the line going to the carburetor to see if any gas is being sent through?


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: Fuel Pump Problem 235 engine
Jon G #1383242 Tue Nov 03 2020 12:30 AM
Joined: Feb 2000
Posts: 44
R
Wrench Fetcher
The pump functioned when not mounted on the engine. Gas in - gas out when tested. It has not worked on the engine. The line to the carb has been disconnected. I'm pretty sure the pump I got back from the rebuild service is the same pump I sent in. However, if not, is there a difference between the pump for a 216 and a pump for a 235? Do they look similar, but aren't interchangeable?

Re: Fuel Pump Problem 235 engine
Rusty 54 #1383248 Tue Nov 03 2020 12:51 AM
Joined: Mar 2014
Posts: 1,771
J
Shop Shark
Rusty it has been a long while since I've had a 216 fuel pump to compare and somebody may correct me on this, but I believe the two pumps were the same basic design. It seems to me that the position of the inlet and outlet might be different, however I want to say that was the only thing. It makes me wonder if your camshaft is moving the pump lever in/out. There is a lobe on the camshaft which does this. I've been known to stick my finger in while somebody cranks the starter to see if the lobe is ok or if it has been damaged. If you do this, please be really careful. It is a good way to mess up a finger real quick if you have it in the wrong place, but it is one way to know if your lever is or isn't moving.

Before you do this, however let's ask a couple of other questions. Has the truck been running? Do you know if the gas tank is plugged up, gummed up, etc? Do you know if the fuel line from the tank to the pump is ok? And do you know if the line from the pump up to the carburetor is ok? Ok meaning clear and free flowing.


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: Fuel Pump Problem 235 engine
Rusty 54 #1383251 Tue Nov 03 2020 12:55 AM
Joined: Feb 2004
Posts: 21,577
H
Boltergeist
Use a bright light and an inspection mirror to look at the cam- - - - -poking a finger in there is s vary good way to make the camshaft rust- - - -blood is salty!
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 Problem 235 engine
Rusty 54 #1383258 Tue Nov 03 2020 01:18 AM
Joined: Mar 2014
Posts: 1,771
J
Shop Shark
Yeah, Jerry is right. Plus you'll dilute your oil with the bleeding. Choose the safe approach.


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: Fuel Pump Problem 235 engine
Rusty 54 #1383289 Tue Nov 03 2020 04:37 AM
Joined: Feb 2004
Posts: 21,577
H
Boltergeist
Part of the orientation safety lecture for new students at the beginning of every school year was "Don't bleed on my tools- - - - -it makes 'em rust!"
LOL!
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 Problem 235 engine
Rusty 54 #1383293 Tue Nov 03 2020 05:34 AM
Joined: Feb 2016
Posts: 440
7
Shop Shark
And the pieces of flesh and bone chips will plug up the oil pump inlet screen.


1957 Chevrolet 5700 LCF 283 SM420 single speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto
Re: Fuel Pump Problem 235 engine
Rusty 54 #1383473 Wed Nov 04 2020 09:22 PM
Joined: Dec 2017
Posts: 866
D
Shop Shark
And you can't hear if there is a valve tap over the screaming.


Mike
Re: Fuel Pump Problem 235 engine
Rusty 54 #1383546 Thu Nov 05 2020 04:29 PM
Joined: Apr 2005
Posts: 1,798
R
Shop Shark
You stated that you tested the newly rebuilt pump before you installed it. I don't know how much truth there is to it but I was taught to never hand operate the lever on the pump to "test" it. The theory is that the lever only moves a small amount on the cam and the diaphragm can be damaged by moving it too far.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
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