Still fuel starved

[notoptoy]

yes, that could be it, there is a critical difference in some of the pumps involving a thicker base flange and the spacer. With a short arm, you may need to forgo the spacer and mount direct to the block. It sounds like either the pump you had or the new one is mismatched to the spacer. Can you include a shot of the two arms, the two bases and the spacer you are dealing with?

[Natenate4s]

I brilliantly threw away the bottom half of my pump. I knew I shouldn't have the second I did it, but left it in the trash can anyway.

[len62]

Hi,
If the arm length is shorter then your original pump arm, you probably have the wrong fuel pump. The fact that you can pump manually with excellent flow tells us your pump works.
Before I replaced my old pump, I researched non stock options ( trying to save quite a bit of money). From many topic discussions from our community, it appears there are many varaibles with fuel pumps/model years, with differences in arm length, spacer width, and fuel connection fittings. Check some of our vendor sites...Rallye has excellent descriptions and pictures showing you the correct pump for your car. Check it out, mine came within the week, from Washington to New Jersey.

[Natenate4s]

I've been talking to Sid and he didn't think mounting it without the spacer was the best option but worth a try. I'll give it a try and get back to you.

[Natenate4s]

Here's some pics of the arm. Does it go over or under the cam (that bar inside the block-that's what that pic is)? I took off the spacer but I can't get it to flush up to the block. It'll only go to the point where the spacer would be. I only tried to push it on, not force it with bolting it.

[Natenate4s]

Here's a couple pics from Rally. The bar looks skinnier and longer to me.

[notoptoy]

The bar from the pump rests on the cam (above), depending on where the lobe on the cam is located when installing, it could be "pushing" on the arm resisting sitting flush. If you can rotate the engine a 1/4 turn or so and the pump will then flush up you may be OK. Bottom line is, it looks like you have the wrong pump.

[mraitch]

maybe you could shave the spacer

[Linda]

You might want to go back to the Rallye site to read up on the 2 types of pumps, the early and late. The late pump has the long arm like in your pic, and is not rebuildable, completely. The early pump has a shorter arm and is rebuildable. The diaphram can twist out for replacement. The late pump does not let it twist out. But some have driven the pin in the arm out to get around that.
As I understand it you must have the spacer for both types of pumps.
Also the cam lobe can wear eventually so this is sometimes the problem too. Then you need an electric pump and a block off plate.
The round brass parts have to be oriented correctly too.
And all screws must be very tight for it to pull fuel.

Linda

[Gregs672000]

Problem started with new pump, correct? I might take a look at the pumps side by side, as some arms were longer than others, some pump bodies thicker, some spacers were different as I recall. Could be that the pump is not being actuated properly by the cam. That fuel filter looks low to me. My friend Frank Zappa (Joe) suggestion on a pump test is a good idea as well. That should tell you what's what with the pump anyway...

Nailed it!
I would imagine that, given the pump is not pumping enough, it has a shorter arm than your previous pump. I think we're gonna need to locate a few pumps (worn out or otherwise unneeded) and put them side by side, then see which one is gonna work, then see if it can be rebuilt, etc. The other option is going electric (like I did), which has some pros and cons, but at least your car will run! I may have a few old pumps sitting around that you are welcome to if they exist...

[Natenate4s]

I don't think I'll modify any of the parts. I just don't have the tools or craftsmanship. I thought about an electric pump, I even bought one. But all the wiring,fuses, splicing, etc is too complicated for me. Lol. I'm a bolt on/bolt off kinda guy. That's why I went mechanical.
Thanks for the offer Greg. Sid is going to look for an old pump for me. If he doesn't have one I'll hit ya up.

[Gregs672000]

No worries, good hunting!

[jamesw]

Try an electric pump - they are only $30 at Autozone and you can run on that until you get the proper mechanical pump.

James

[Gregs672000]

A fuel pump block off plate for a Chevy 350 fits if you decide to go electric.