Hello. I have an '84 RV e350 7.5 litter engine that is not pushing gas to the carburetor. I changed the fuel filter to a clear one and it only fills when I cracks the engine initially. Then it does not fill up when I let it idle. And it dies when I push the gas. I'm thinking the fuel pump is bad. Can anyone confirm if this is the fuel pump?

 

I'm not familiar with that year, but that doesn't look like any fuel pump I've ever seen. Generally, on later model vehicles (with fuel injection), the fuel pump is inside the fuel tank. This is to keep it cool, as fuel injection requires high pressure, and those pumps work hard.

On earlier, carbureted vehicles, the fuel pump is on the side of the engine block, with an arm that goes into the engine block and engages a jackshaft which has a lobe on it to operate the arm.

These are generalizations, but I suggest you just start following the fuel lines to see where they go.

 

I followed the fuel lines and this is where they led me. I'm guessing the actual fuel pump is above the fuel tank. Thanks for your input. Anything helps because I don't know much and the manual does not show specifics in regards to the fuel pump.

 

The fact that you get fuel while cranking, but not running, sounds more like a power issue. I don't know how your RV is set up, but typically power will come from two different places during cranking and running.

 

I think you're right. Would you have any idea where the fuel relay is? Would it be with the fuel pump above the gas tank?

 

More likely IN your fuel tank. But EagleFreek is on the right track, I think. You should have a power distribution box in your engine compartment. There will be some relays in there. Most automotive relays are the same basic relay, and are interchangeable. Try swapping around any relays that are physically compatible. No worries - if the are physically compatible, they are the same electrically.

If your problem moves to another circuit, you have found your culprit. Check all fuses while you are in there, of course. Doesn't hurt to pull each one (one at a time!) and clean the contacts with some CRC.

 

That looks like a tank switch to me. Does it have dual fuel tanks ? On a 460, the fuel pump will be mounted on the timing cover on the driver's side front of the engine. It might have an auxillary pump on the frame rail between the tank and engine pump.

 

OP has a 1984 E350 460, so it has a 4V not EFI .. The fuel pump should be mounted on the timing cover (see 9350 in pic), not in a fuel tank.

E250/350 460 didn't have an electric fuel pump until 1986.

 

Thanks everybody for helping. I replaced the relays and everything is working well! Aside from the engine flooding with gas because the fuel pump kept running after I shut the vehicle off.

 

There it is. Old school.

Am I seeing that right? I comes with a 2 barrel?

 

Yes, you are seeing it right, but you are taking the 'generic' pic out of context.

It's generic because as the caption states, it includes 255/302/351W/460 .. 255/302 only available with 2V, 351W available with 2V & 4V

But no 460 of any year came with a 2V!

 

Oooohkay. I feel better now!

 

No, but some 429's did.

 

Yes, but...how many 429's were installed in F100/350's? The same number that were installed in Henways.

 

I'm not necessarily a fan of those chassis but with a 429--Boss 429 maybe?---I might be a convert!? One of those in front of a performance built C6 would be a snappy ride indeed.