Fuel Pump

Scott,
Have you tried Then and Now?

For up to 85. I see 3745414 (Sierra 18-7254) part number for your 318. Appearantly minor differences

Of course you can but it wherever is easy and best price as Pete’s then and now. I just bought mine so trying to steer you to schematic and part number   Check then and now too

Since you're looking for a new pump, I think 67 ski nat has given you a good number with the 18-7254 pump that has the leak off line to the carburetor flame arrestor in case of a ruptured diaphragm.

His 18-7264 works with his 67 model year engine because the leak off line hadn't come into existence yet

Since you have the fitting, you must have the clear tubing line going up to the flame
arrestor I'd imagine.

Your old one may be rather hard to get apart,and back together but you could talk to Then and Now

Fiberglassic wrote: Yes, clear tube connects to a barb off the carburetor riser. Can I block that off and not worry about the leak off port on the fuel pump? Or is that a safe to have marine thing? .

Call it a marine safety feature

And keep it

Found a pump on eBay that'll work. The in fitting is a 3/8 barb instead of threaded which is better because I converted to marine 3/8 hose last year. The out side is the very same except positioned just a little differently. This is the only one I could find, and let me tell you, I worked hard to find it. There are lots out there but only a few with the fuel bleed line I needed, all but the one I got had a 5/16 hose barb which was to small for my setup. It seems Chrysler used this in a few of their V8 motor cars in 1976 - 1978 only. This is why finding NOS is next to impossible.

Fiberglassic wrote: Found a pump on eBay that'll work. The in fitting is a 3/8 barb instead of threaded which is better because I converted to marine 3/8 hose last year. The out side is the very same except positioned just a little differently. This is the only one I could find, and let me tell you, I worked hard to find it. There are lots out there but only a few with the fuel bleed line I needed, all but the one I got had a 5/16 hose barb which was to small for my setup. It seems Chrysler used this in a few of their V8 motor cars in 1976 - 1978 only. This is why finding NOS is next to impossible.

May be kinda silly of me to ask. but where's the tube for sending fuel from a ruptured diaphragm back to the carburetor?

I don't see one in your pictures.

Or is this gonna become a do it yourself marine fuel pump?

67 SkiNat gave you a part number (18-7254) for a Sierra with the appropriate line that's pretty easy to find for sale.

Here's one in the link below

link

Fiberglassic wrote: The tube had to be removed from the old pump which is done, and will be inserted into the hole of the new pump which I haven't done yet. The hole of the new pump functions the same way as the original pump causing a suction when the actuating lever is pushed. I didn't go for the Sierra 18-7254 because the actuating lever was not the same shape, the tube and the upper part of the pump was totally different from the original, and no one could tell me for sure that this pump would work on my engine. Thanks for all the inputs from everyone...Scott

So' I guess it is the homegrown do it yourself marine pump.

Now if you'd asked in this thread if the Sierra 18-7254 would fit and work right, you would have got an answer

For the next guy with the same question the answer is Yes.

Painted, installed, and ran my new home grown fuel pump for 5 minutes, all went excellent, and the engine immediately fired right up. I would go this NOS route again if possible for originality reasons and the cost was 2/3 less than the Sierra pump.

8122pbrainard wrote: Fiberglassic wrote: I would go this NOS route again if possible for originality reasons ] Scott, Glad it worked out for you. BTW, I wouldn't worry about originality on your new engine.

I agree with Pete   

Do you have a manual for that later (1980's) LM series engine with a good section on that Quadrajet carburetor?

If the answer to the above is No, do you want one (electronically) ?

Scott

The link below has the manual. 123 pages of info on the later 318/360.

You'll notice some things missing such as fuel pump info, but good stuff on the carburetor and Chrysler electronic ignition and most everything else

There's a wiring diagram on page 82

link    

Yes, cosmetically only. Took the exhaust manifolds off last winter to inspect and repaint. When they were off, I paint touched up the engine wherever I could.