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Priming new fuel pump?
#1374260 Fri Aug 21 2020 12:40 PM
Joined: Aug 2020
Posts: 23
NorAlta Offline OP
I just installed a new fuel pump on my 216. last one worked great, but diaphram started to leak. Installed new one, and cant get fuel past it. Feel like Im missing a simple step here. Any advice?

Re: Priming new fuel pump?
NorAlta #1374585 Sun Aug 23 2020 07:49 PM
Joined: Jan 2020
Posts: 473
Probably a dumb question, but is the pump correctly matched up to the pushrod that is actuated by the cam? I don't know if that setup applies here.

1957 Chevy Panel Truck, powered by SBC 350 from 1977 Camaro
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Re: Priming new fuel pump?
NorAlta #1374622 Mon Aug 24 2020 02:31 AM
Joined: Aug 2020
Posts: 23
NorAlta Offline OP
Thanks guys.
Long story, but got it sorted.
Truck ran fine before. I put the new pump on and started the truck. Float bowl was full. Should’ve been lots of time to get fuel up top. Truck ran until float bowl was empty and died. Thought that was weird so I cracked the fuel line on the inlet inlet side of the pump fuel leaked instantly. I cracked the line on the outlet side of the pump it was dry. Nothing. I filled up the float bowl again and started the truck left the line off the pump nothings coming out. I removed the pump and took it to the bench I rigged up a small line and bottle of gas to the inlet side and hand pumped the cam arm. Nothing. The old pump would squirt fuel 2’. I took the new pump apart to have a look and see if I could figure out what was wrong. Not seeing anything obvious but I noticed the diaphragm looked an awful lot like the one from my original pump. I decided to put the new diaphragm and spring into the old pump. Works perfect LOL
Old pump was leaking fuel past the diaphragm and out the weep hole. Alls well that ends well.

Re: Priming new fuel pump?
NorAlta #1374632 Mon Aug 24 2020 03:39 AM
Joined: Jul 2000
Posts: 1,270
Must be a stuck check valve in that new pump.

Got it working - that's all that matters.

Last edited by Gord&Fran; Mon Aug 24 2020 03:40 AM.

1954 1/2 ton 235 4 speed
Re: Priming new fuel pump?
NorAlta #1374652 Mon Aug 24 2020 12:32 PM
Joined: Apr 2005
Posts: 9,893
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
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Re: Priming new fuel pump?
NorAlta #1374670 Mon Aug 24 2020 04:59 PM
Joined: Jan 2007
Posts: 199
Shop Shark
In my case, my new Delphi 6 cylinder 250 fuel pump was WAY too much pressure for the stock one barrel Rochester and created massive leaking and flooding. Diaphragm and spring nowhere near factory spec and useless. Probably would work with something aftermarket. .maybe... but for sure not within spec. Fortunately I was advised to check pressure and then discovered the problem and had the old dirty pump. Cleaned it up and away we went.

Rasman 1971 Chevy C10 stock 260 6 cyl 3 on the tree manual everything.
1959 Chevy 1/2-Ton []

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