fuel pump options?

[husker77]

So are our only options for a fuel pump for the amc v8's, stock replacement, pretty expensive(at least for my jeep) bulltear billet beauty, or electric? Or finding an older carter high perf one on ebay or something?

[FSJ Guy]

Why do you need something other than the stock replacement? They either work or they don't. Unless you're running out of fuel at WOT, why pay more for more flow? The float will regulate how full the bowl is.

[husker77]

Why do you need something other than the stock replacement?

Eventually this will be a built motor, and I have to replace my fuel pump so I would like to get one that will be up to the task. I've also read a few times that the stock pump is barely adequate for a stock motor.

They either work or they don't.

Mine is actually still working fine but leaking, so that statement is not entirely true.

[csuengr]

Well, considering those diaphragm pumps were used on stock engines up to around 500 hp or more, they work rather well.

If you are looking for other pumps, go to summitracing.com. Enough fuel pumps to make your head spin.

[husker77]

When did amc build an engine with 500hp? I don't see anything over about 350.

[fulsizjeep]

HaHa, maybe some bigger V8 besides AMC. If you stick with a mechanical pump, might I recommend one specifically for a 71 360 Wagoneer. They are old school "upside down" style. They are not tucked up behind the PS pump to catch more heat like the newer ones. We have had bad luck with vapor lock on NAPA brand (Echlin I think) mechanical in the newer style. If you go electric, there are a variety and I have had good luck with a few of them. Even some of the cheaper ones that eventually failed last around 10 years.

[wewillsurvive]

HaHa, maybe some bigger V8 besides AMC. If you stick with a mechanical pump, might I recommend one specifically for a 71 360 Wagoneer. They are old school "upside down" style. They are not tucked up behind the PS pump to catch more heat like the newer ones. We have had bad luck with vapor lock on NAPA brand (Echlin I think) mechanical in the newer style. If you go electric, there are a variety and I have had good luck with a few of them. Even some of the cheaper ones that eventually failed last around 10 years.

Now that is some good info to have if looking for a stock replacement. Thanks.

I have a Holley blue pump in my Demon feeding the 451 I have had it for about 15 years and it still works great.

[husker77]

might I recommend one specifically for a 71 360 Wagoneer. They are old school "upside down" style. They are not tucked up behind the PS pump to catch more heat like the newer ones.

I think it would have to be a 72, from what I'm getting a 71 would still have the 350(buick?) in it. Then looks like in 76 is when they "flipped" them over. So you would want one for a 72-75.

[tgreese]

might I recommend one specifically for a 71 360 Wagoneer. They are old school "upside down" style. They are not tucked up behind the PS pump to catch more heat like the newer ones.

I think it would have to be a 72, from what I'm getting a 71 would still have the 350(buick?) in it. Then looks like in 76 is when they "flipped" them over. So you would want one for a 72-75.

The 360 officially started in the FSJs in 1971. 1970 was the last year for the 350... officially. Some overlap has been reported. Just FYI.

Yep, in the mid 70s, the fuel pump flipped over. AFAIK there are only those two variants - pre-76 type and post-75 type.

[husker77]

Got to love those crossover years when they are using up the last of the parts.

[serehill]

Regardless one of the best mods I EVER did was my electric pump. It's a whole lot easier to compare when you've been on both sides. How many vehicles today have manual pumps? Starts faster runs better wouldn't know how to vapor lock. Starts just as fast after sitting for six months as it does for six minutes. Saves batteries starters solenoids. turn in on the key count to 5 pump it once & in less than 5 seconds it fires. Simple fact.

[AwesomeJ10]

Starts faster runs better wouldn't know how to vapor lock.

Yep - electric pumps are great. But I don't think they completely solve the vapor locking problem (unless, of course, they are pushing a TBI).

[serehill]

No doubt I'm open to hearing about any proper good electric fuel pump that vapor locks. No diaphragms. Anyone seen one? Remember the criteria of the statement.
I'm not talking about someone who bolted the electric pump onto the exhaust manifold.

Fuel pump away from the engine with a vented fuel filter & tanks.

Anyone? I'm sure it somehow can be done not in denial here but I haven't seen it.

EFI rocks but it's not a vapor lock preventer.

[husker77]

As pressure increases the boiling point of fuel(actually pretty much any liquid) raises. That is one of the reasons for mounting the pump back towards the tank, it increases the pressure throughout the system. In my experience most vapor lock issues are a pressure issue and not a heat issue.

[serehill]

Yeah sorry I digressed. It's an option. It has a lot of positive points if your looking to fix it once & for all with some great side effects. Not saying at all itsthe only way but I prefer it.

Good luck

[husker77]

I'm really leaning towards electric, just trying to figure out if I can plumb it into the stock fuel lines for now. It seems like right in front of the tank there is a decent place to mount one and then tie into the stock lines. There is a section of rubber lines that tie the tank hard lines to the frame hard lines, seems pretty simple. But I've said that more than once on a project.

[twmattox]

Not sure on a '77; but, on my '88 the lines leave the fuel tank to the rear. Right near the crossmember above the axle is the ideal place to mount an electric pump. Ties right into the rubber lines there. Minimal lines under vacuum and the long run under positive pressure (minimizes vaporization).

[wewillsurvive]

This thread is going to pay dividends in the AM as I'm pretty sure my pump is junk. Thanks for all that have provided info to the OP and me.


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[husker77]

Not sure on a '77; but, on my '88 the lines leave the fuel tank to the rear. Right near the crossmember above the axle is the ideal place to mount an electric pump. Ties right into the rubber lines there. Minimal lines under vacuum and the long run under positive pressure (minimizes vaporization).

Mine 77 has the tank mid ship but sounds like the lines are set up similar.

[wewillsurvive]

Ok so I miraculously found a mechanical pump in my town that doesn't have to be ordered in. They are saying its for a 73 Waggy with a 360, with the vin letter of "A" does the vin letter even matter??? It's going on my 86


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